Best Celery Root Gratin Recipes

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GRATIN OF CELERY ROOT AND POTATO



Gratin of Celery Root and Potato image

Provided by Food Network

Categories     side-dish

Time 1h25m

Yield 8 servings

Number Of Ingredients 6

2 pounds Yukon gold potatoes, scrubbed
2 pounds celery root
3 ounces (6 tablespoons) butter, thinly sliced, plus additional for buttering the casserole dish
Sea salt
1 cup grated Beaufort cheese
4 ounces heavy cream

Steps:

  • Preheat the oven to 375 degrees F.
  • Slice the potatoes into 1/4-inch-thick rounds. Peel the celery root and cut into 1/4-inch-thick slices to resemble the potatoes.
  • Butter a heavy oval casserole dish. Layer the potatoes in the bottom of the dish, followed by the butter and then a layer of celery root. Sprinkle with sea salt. Top with a layer of half of the cheese. Repeat with the remaining potato and celery root. Top with the cream and then the remaining cheese.
  • Bake until deep golden brown, about 1 hour.

POTATO & CELERY ROOT GRATIN WITH LEEKS



Potato & Celery Root Gratin with Leeks image

Provided by Susan Spungen

Categories     Milk/Cream     Cheese     Potato     Side     Bake     Thanksgiving     Vegetarian     Dinner     Casserole/Gratin     Leek     Root Vegetable     Fall     Bon Appétit     Pescatarian     Wheat/Gluten-Free     Peanut Free     Tree Nut Free     Soy Free     No Sugar Added     Kosher

Yield Makes 8 to 10 servings

Number Of Ingredients 10

3 cups heavy cream
2 garlic cloves, peeled
1 sprig thyme plus 3 teaspoons fresh thyme leaves, divided
2 tablespoons (1/4 stick) unsalted butter, divided
3 leeks, white and pale-green parts only, halved lengthwise, thinly sliced crosswise
Kosher salt
2 pounds russet potatoes, peeled, very thinly sliced crosswise (1/8" thick)
1 pound celery root, peeled, very thinly sliced crosswise (1/8" thick)
2 cups grated Gruyère
Freshly ground black pepper

Steps:

  • Preheat oven to 350°F. Heat cream, garlic, and thyme sprig in a medium saucepan just until bubbles begin to form around edge of pan. Remove from heat; set aside to steep.
  • Melt 1 tablespoon butter in a medium skillet over medium heat. Add leeks; season with salt and cook, stirring often, until tender (do not brown), 10-12 minutes. Transfer to a small bowl and set aside.
  • Butter a 3-quart gratin dish with remaining 1 tablespoon butter. Layer 1/3 of potato slices and 1/3 of celery root slices evenly over bottom of baking dish. Cover with 1/3 of leeks, then 1/3 of Gruyère. Sprinkle with salt, pepper, and 1 teaspoon thyme leaves. Repeat layers twice more. Strain cream mixture into a medium pitcher and pour over vegetables.
  • Set gratin dish on a large rimmed baking sheet and cover tightly with foil. Bake for 1 hour. Carefully remove foil; continue baking until top is golden brown and sauce is bubbling, 25-30 minutes. DO AHEAD: Can be made 2 hours ahead. Let stand at room temperature. Tent with foil and rewarm in a 300° oven until hot, about 20 minutes.

POTATO AND CELERY ROOT GRATIN WITH CAPER BROWN BUTTER



Potato and Celery Root Gratin With Caper Brown Butter image

This is the perfect side dish to a Sunday roast or winter spread. Cutting the vegetables into batons as opposed to thinly slicing them lends a wonderful texture to the dish, and it looks pretty funky too. If you can't find celeriac (celery root), then swap it out for an equal amount of Yukon Gold potatoes or similar semi-waxy potatoes. This is the kind of dish that tastes better as it sits, so feel free to serve it at room temperature if you prefer, adding the brown butter just before serving.

Provided by Yotam Ottolenghi

Categories     casseroles, main course, side dish

Time 2h30m

Yield 4 to 6 servings

Number Of Ingredients 16

6 tablespoons/80 grams unsalted butter
2 tablespoons olive oil, plus more for foil
2 medium yellow onions, peeled, halved and sliced into thin half-moons (about 12 ounces/360 grams)
Salt and black pepper
5 garlic cloves, minced
2 tablespoons thyme leaves, plus 3 sprigs
1 1/2 tablespoons white miso
3/4 cup/180 milliliters dry white wine
1 large celery root (celeriac) (about 1 3/4 pounds/800 grams), peeled and cut into scant 1/2-inch/roughly 1-centimeter-thick batons (about 1 1/3 pounds/600 grams peeled)
1 1/2 pounds/680 grams Yukon Gold potatoes, peeled and cut into scant 1/2-inch/roughly 1-centimeter-thick batons
1 tablespoon all-purpose flour (plain flour)
1 1/4 cups/300 milliliters chicken stock (or vegetable stock)
5 1/2 ounces/150 grams Gruyère, roughly grated (1 1/2 packed cups)
2 1/2 tablespoons nonpareil capers, drained and patted dry
2 lemons
1/4 lightly packed cup/10 grams finely chopped fresh chives

Steps:

  • Heat the oven to 375 degrees Fahrenheit/180 degrees Celsius.
  • Add 2 tablespoons/30 grams of butter and all the oil to a medium (10-inch/26-centimeter) ovenproof sauté pan over medium-high heat. Once melted, add the onions and 1/2 teaspoon salt, turn the heat down to medium-low and cook, stirring occasionally, until onions are softened and have taken on a light coloring, about 15 minutes. Add the garlic and thyme leaves, and cook for another 3 minutes, stirring occasionally, until fragrant. Stir in the miso and wine, and cook until liquid is reduced by half, about 4 more minutes. Remove from the heat.
  • In a large bowl, very gently toss together celery root (celeriac), potatoes and flour with 1 1/2 teaspoons salt and a generous grind of pepper. Stir in the onion mixture to coat, then transfer everything back into the skillet, piling the vegetables haphazardly, so that the batons are pointing in different directions. Pour in the stock. Lightly grease a piece of foil with a little oil, then tightly cover the pan (oiled side down) and bake for 1 hour, or until the vegetables have cooked through.
  • Remove the foil, and turn the oven temperature up to 450 degrees Fahrenheit/210 degrees Celsius. Sprinkle over the Gruyère and return the dish to the oven for 30 minutes, or until nicely browned on top, rotating the dish halfway. Leave to settle for at least 20 minutes while you make the brown butter (beurre noisette).
  • Add the remaining butter and the thyme sprigs to a small saucepan, and place it over medium heat. Once melted, cook for 3 to 5 minutes, stirring occasionally, or until it starts to smell nutty (add more or less time if necessary). Add the capers (carefully, as they might spit) and cook for 4 more minutes, or until they darken and burst. Off the heat, stir 1 tablespoon lemon juice from 1 lemon, chives and another good grind of pepper.
  • Pour the caper brown butter all over the top of the gratin and serve warm, with the remaining lemon sliced into wedges to squeeze alongside.

CELERY ROOT, POTATO AND PEAR GRATIN



Celery Root, Potato and Pear Gratin image

Provided by Food Network

Time 2h10m

Yield 6 to 8 servings

Number Of Ingredients 11

1 teaspoon chopped fresh thyme
Unsalted butter, softened, for the baking dish
1/2 large celery root (about 1 pound)
6 tablespoons extra-virgin olive oil
1 pound red bliss potatoes
1 large Bartlett pear
Sea salt and freshly ground pepper
3/4 cup heavy cream
1 clove garlic, smashed
1 cup grated gruyere cheese (about 3 ounces)
2/3 cup grated parmesan cheese (about 2 ounces)

Steps:

  • Preheat the oven to 375 degrees F. Lightly butter a shallow 2-quart baking dish.
  • Line a baking sheet with paper towels. Peel the celery root, then quarter and slice 1/4 inch thick. Heat 2 tablespoons olive oil in a large skillet over medium heat. Working in batches, add the celery root to the skillet in a single layer and cook, turning, until browned, about 10 minutes per batch. Remove with a slotted spoon and drain on the paper towels.
  • Meanwhile, peel the potatoes and slice 1/4 inch thick. Add another 2 tablespoons olive oil to the skillet. Working in batches, add the potatoes in a single layer and cook, turning, until browned and tender, about 10 minutes per batch. Remove with a slotted spoon and drain on the paper towels with the celery root.
  • Peel the pear, core and slice 1/4 inch thick. Add the remaining 2 tablespoons olive oil to the skillet. Add the pear in a single layer and cook, turning, until browned, about 10 minutes; transfer to the paper towels. Lightly season the celery root, potatoes and pear with salt and pepper.
  • Heat the cream and garlic in a saucepan over medium-high heat until just simmering; remove from the heat. Combine the gruyere, parmesan, thyme and 1 teaspoon each salt and pepper in a bowl.
  • Spread the celery root in the prepared baking dish. Sprinkle one-third of the cheese mixture on top. Remove the garlic from the cream, then pour one-quarter of the cream over the cheese. Layer the potatoes on top, then sprinkle with another one-third of the cheese mixture; pour another one-quarter of the cream on top. Top with the pear slices and sprinkle with the remaining cheese mixture. Pour the remaining cream over everything.
  • Cover the dish with aluminum foil and bake 30 minutes, then uncover and bake until the gratin is bubbly and browned, 5 to 10 more minutes. Let cool 15 minutes before serving.

POTATO AND CELERY ROOT GRATIN WITH FONTINA CHEE]SE



Potato and Celery Root Gratin with Fontina Chee]se image

Categories     Cheese     Potato     Vegetable     Side     Bake     Thanksgiving     Casserole/Gratin     Celery     Bon Appétit

Yield Serves 8 to 10

Number Of Ingredients 9

1 teaspoon salt
1/2 teaspoon pepper
1/4 teaspoon ground nutmeg
3/4 cup thinly sliced shallots
2 1-pound celery roots, peeled, halved, thinly sliced
2 pounds russet potatoes, peeled, thinly sliced
2 cups whipping cream
1 cup canned chicken broth
8 ounces Fontina cheese, grated

Steps:

  • Preheat oven to 400° F. Mix salt, pepper and nutmeg in small bowl. Sprinkle half of shallots in 16-cup oval gratin dish or 15x10x2-inch glass baking dish. Top with half of celery root and half of potatoes. Sprinkle half of spice mixture over. Repeat layering with remaining shallots, celery root, potatoes and spice mixture. Bring cream and broth to simmer in medium saucepan. Pour over vegetables. Cover tightly with foil.
  • Bake until vegetables are almost tender, about 45 minutes. Increase oven temperature to 450° F. Press potatoes with spatula to even thickness. Bake uncovered until juices thicken, about 10 minutes. Top with cheese. Bake until cheese melts and browns, about 15 minutes. Cool 15 minutes before serving.

CELERY ROOT FENNEL GRATIN WITH GRUYERE



Celery Root Fennel Gratin with Gruyere image

Provided by Food Network

Categories     side-dish

Time 1h20m

Yield 8 servings

Number Of Ingredients 8

1 large celery root, about 1 pound, peeled and thinly sliced
2 baking potatoes, like russets, peeled and thinly sliced
2 fennel bulbs, thinly sliced
1/2 cup unbleached all-purpose flour
1/2 teaspoon salt
1/2 teaspoon freshly ground black pepper
1 quart milk
12 ounces Gruyere (or Swiss cheese), shredded (3 cups)

Steps:

  • Preheat oven to 350 degrees. Lightly butter a 3-quart baking dish. Place the celery root, potatoes, and fennel in a large bowl and toss well.
  • In a large measuring cup, combine the flour, salt, and pepper. Whisk in the milk.
  • Layer 1/3 of the vegetables in the prepared baking dish. Sprinkle with 1/3 of the cheese. Repeat layering, reserving the last 1/3 of the cheese.
  • Pour the milk mixture over all, pressing the vegetables to coat them. Sprinkle the remaining cheese on top. Bake for 1 hour, or until the vegetables are very tender.

CELERY ROOT GRATIN



Celery Root Gratin image

Provided by Food Network

Time 50m

Yield 12 servings

Number Of Ingredients 9

3 pounds potatoes
4 pounds celery root
1 cup heavy cream
1 stick butter
1/2 teaspoon saffron
2 cloves garlic, minced
2 1/2 cups gruyere
Salt and pepper
1/2 cup chopped flat leaf parsley

Steps:

  • Peel and coarsely chop the potatoes and the celery root. Put potatoes and celery root in separate pots and add salt to each.
  • Boil the potatoes and celery root until soft, and then drain them.
  • Pour the heavy cream into a pot and bring it to a boil. Add the butter, saffron, garlic, and 1 cup of the gruyere. Cook about 5 minutes over moderately low heat until the cream mixture is bright yellow.
  • Puree drained celery root in food processor, gradually adding yellow cream mixture.
  • Mash the drained potatoes to a rough texture.
  • Add pureed celery root to mashed potatoes. Add the rest of the gruyere and mix together. Season with salt and pepper.
  • Butter a 13 by 9-inch gratin dish and put the puree in it. Sprinkle with the parsley.
  • Bake at 400 degrees for about 15 minutes.

POTATO, CELERY ROOT AND STILTON GRATIN



Potato, Celery Root and Stilton Gratin image

Categories     Milk/Cream     Cheese     Dairy     Potato     Vegetable     Side     Bake     Blue Cheese     Celery     Bon Appétit     Wheat/Gluten-Free     Peanut Free     Tree Nut Free     Soy Free     No Sugar Added

Yield Serves 6

Number Of Ingredients 7

2 pounds russet potatoes, unpeeled, thinly sliced
1 pound celery root (celeriac), peeled, halved, thinly sliced
2 cups low-salt chicken broth
1 cup whipping cream
3 large shallots, thinly sliced
1/2 teaspoon celery seeds
2 cups crumbled Stilton cheese

Steps:

  • Preheat oven to 400°F. Combine first 6 ingredients in heavy large skillet. Bring to simmer. Reduce heat to medium-low, cover and cook 10 minutes, turning vegetables occasionally.
  • Using slotted spoon, transfer half of vegetables to 9x13-inch baking dish. Season with salt and pepper. Sprinkle 3/4 cup cheese over. Top with remaining vegetables. Pour cooking liquid over. Season with salt and pepper. Sprinkle 3/4 cup cheese over. Cover with foil; bake 45 minutes. Uncover; sprinkle with remaining 1/2 cup cheese. Bake until liquid is almost absorbed, about 55 minutes. Cool 20 minutes before serving.

CELERY ROOT AU GRATIN



Celery Root au Gratin image

Provided by Pierre Franey

Categories     easy, quick, side dish

Time 30m

Yield 4 servings

Number Of Ingredients 8

1 large celery root, about 2 pounds
2 potatoes, about 1 pound
Salt to taste, if desired
Freshly ground pepper to taste
1/4 teaspoon freshly grated nutmeg
2 tablespoons butter
1/3 cup heavy cream
1/4 cup freshly grated Parmesan cheese

Steps:

  • Peel celery root and cut into 1-inch cubes. There should be 6 to 7 cups.
  • Peel potatoes and cut into 1-inch cubes. Combine potatoes and celery-root pieces in a saucepan. Add water to cover and salt to taste. Bring to a boil and cook about 15 minutes or until vegetable pieces are tender.
  • Meanwhile, preheat broiler to high.
  • Drain vegetables and pour them into the bowl of a food processor. Blend thoroughly and add salt, pepper, nutmeg, butter and cream. Blend well.
  • Spoon and scrape mixture into a small baking dish and smooth over the top. Sprinkle evenly with Parmesan cheese.
  • Place dish under broiler about 6 inches from heat. Broil about 5 minutes or until cheese is nicely browned and glazed.

Nutrition Facts : @context http, Calories 298, UnsaturatedFat 5 grams, Carbohydrate 34 grams, Fat 16 grams, Fiber 6 grams, Protein 8 grams, SaturatedFat 10 grams, Sodium 873 milligrams, Sugar 4 grams, TransFat 0 grams

GRATIN OF CELERY ROOT



Gratin of Celery Root image

Provided by Moira Hodgson

Categories     easy, casseroles, side dish

Time 1h

Number Of Ingredients 10

2 medium celery roots (about 2 1/4 pounds)
1 cup beef broth, preferably homemade
1 cup milk
1 cup water
1 teaspoon dried summer savory
About 1 teaspoon coarse salt
2 tablespoons unsalted butter
2 tablespoons flour
1/2 teaspoon freshly grated nutmeg
2/3 cup finely shredded Parmesan

Steps:

  • Trim and peel celery root. Cut in three-fourth-inch cubes, placing them in a bowl of water as you proceed.
  • Combine in saucepan with broth, milk, water, savory and one teaspoon salt; liquid should not quite cover. Gently simmer, covered, until barely tender -- about 10 minutes.
  • With a slotted spoon transfer cubes to buttered shallow baking dish of one-and-a-half quart capacity. Strain and reserve liquid. Heat butter in rinsed-out saucepan. Add flour; stir on low heat until golden. Add one-and-a-half cups cooking liquid. Whisk over moderate heat until liquid boils.
  • Sprinkle nutmeg on celery root. Season sauce with salt and pepper to taste; pour over cubes. Sprinkle cheese to cover evenly. Bake in center of preheated 350-degree oven for about 35 minutes, until lightly browned and bubbly.

Nutrition Facts : @context http, Calories 186, UnsaturatedFat 3 grams, Carbohydrate 19 grams, Fat 9 grams, Fiber 3 grams, Protein 9 grams, SaturatedFat 5 grams, Sodium 722 milligrams, Sugar 5 grams, TransFat 0 grams

POTATO AND CELERY-ROOT GRATIN WITH SMOKED HADDOCK



Potato and Celery-Root Gratin with Smoked Haddock image

Categories     Milk/Cream     Fish     Onion     Potato     Bake     Casserole/Gratin     Winter     Gourmet

Yield Makes 6 to 8 servings

Number Of Ingredients 12

2 medium onions, halved lengthwise, thenthinly sliced lengthwise
2 tablespoons unsalted butter
1/2 lb smoked haddock fillet (finnan haddie), thawed if frozen, shredded with your fingers into 1/2-inch pieces, discarding any tough parts
2 tablespoons chopped fresh parsley
1 1/2 lb celery root (sometimes called celeriac), peeled with a knife
2 lb large potatoes (preferably russet or Yukon Gold), peeled
2 cups heavy cream
1/2 cup whole milk
1 teaspoon salt
1/4 teaspoon black pepper
Special Equipment
a Japanese Benriner* or other adjustable-blade slicer; a 13- by 9- by 2-inch or other shallow (2 1/2- to 3-quart) glass or ceramic baking dish

Steps:

  • Preheat oven to 375°F.
  • Cook onions in butter in a 12-inch heavy skillet over moderate heat, stirring occasionally, until softened and just beginning to brown, 7 to 8 minutes. Remove skillet from heat and stir in haddock, 1 tablespoon parsley, and salt and pepper to taste.
  • Halve or quarter celery root to fit slicer. Thinly slice potatoes and celery root (about 1/8-inch thick) with slicer. Layer one third of potatoes and celery root in buttered baking dish. Spread half of haddock mixture on top, then repeat layering with half of remaining vegetables, all of remaining haddock mixture, and then remaining vegetables. Stir together cream, milk, salt, and pepper and pour on top of gratin, then cover dish tightly with buttered foil.
  • Bake gratin in middle of oven until vegetables are just tender, about 1 hour. Uncover and bake, basting 2 or 3 times with pan juices, until top is golden, about 30 minutes more. Let stand 10 minutes, then sprinkle with remaining tablespoon parsley.
  • Available at Asian cookware shops.

FENNEL, APPLE AND CELERY ROOT GRATIN



Fennel, Apple and Celery Root Gratin image

Provided by Laura Werlin

Yield 6 to 8 servings

Number Of Ingredients 6

2 large celery roots (about 1 pound each)
2 fennel bulbs (about 1/2 pound each)
2 Granny Smith or other tart, firm apples (about 1 pound total), peeled and cored
Salt and freshly ground black pepper
About 11/2 cups heavy cream
8 ounces Colby-style cheese, such as Orb Weaver, coarsely grated (about 2 cups; or use aged, but not sharp, cheddar)

Steps:

  • Preheat oven to 375 degrees F. Butter a 2-quart gratin dish or other ovenproof casserole.
  • Cut off the entire rough exterior of the celery roots, making sure that all brown parts are removed. You will be removing about 1/4 to 1/2-inch of the exterior of each. Next, cut each celery root in 1/2 lengthwise. Turn one 1/2 cut side down, and cut into 1/4-inch wide pieces. Repeat with the remaining celery root. Set aside.
  • Cut off the fronds and the dark green parts of each fennel bulb, leaving just the bulb. Cut each bulb in half lengthwise. Cut each half lengthwise into 1/4-inch thick slices.
  • In a vegetable steamer, combine the celery root and fennel and steam for 5 minutes. Remove from the steamer and set aside to cool slightly.
  • Cut the apples into 1/4-inch-thick rings.
  • Place 1/3 of the celery root on the bottom of the prepared dish. Sprinkle with salt and pepper to taste. Overlap with 1/3 of the apple slices, and sprinkle with a little more salt but no pepper. Put 1/3 of the fennel over the apples, and once again sprinkle with salt and pepper. Repeat with the remaining celery root, apple, and fennel. Pour cream around the sides of the dish until the cream reaches about halfway up the dish. Sprinkle the top of the gratin with the cheese. Cover and bake for 35 minutes, or until the vegetables and apple feel tender when pierced with a fork or a skewer. Turn the oven to broil, remove the cover, and broil until the gratin is golden brown and bubbling, about 3 minutes.
  • Let cool 15 minutes to allow the cream to firm up slightly and serve.

POTATO, CELERY ROOT AND FONTINA GRATIN



POTATO, CELERY ROOT AND FONTINA GRATIN image

Categories     Cheese     Potato

Yield 6 to 8

Number Of Ingredients 11

2 tablespoons (1/4 stick) butter
2 cups thinly sliced leeks (white and pale green parts only; about 2 large)
2 pounds russet potatoes, peeled, thinly sliced
1 1/4 cups whipping cream
1 1/4 cups canned low-salt chicken broth
1 14- to 16-ounce celery root, peeled, halved lengthwise, thinly sliced
1 teaspoon salt
1/2 teaspoon pepper
1/8 teaspoon celery seeds
1/8 teaspoon grated nutmeg
1 1/2 cups grated Fontina cheese (about 6 ounces)

Steps:

  • Preheat oven to 400F. Lightly butter 11x7x2-inch glass baking dish. Melt 2 tablespoons butter in heavy large pot over medium-high heat. Add sliced leeks and saute until wilted, about 4 minutes. Add potatoes, whipping cream, chicken broth, celery root, 1 teaspoon salt, 1/2 teaspoon pepper, celery seeds and nutmeg; bring to boil, stirring occasionally to separate vegetables. Boil 5 minutes. Transfer half of potato mixture to prepared baking dish. Sprinkle with half of grated cheese. Top with remaining potato mixture. Cover with foil and place on large baking sheet. Bake 45 minutes. Uncover and bake until juices thicken, about 15 minutes longer. Sprinkle with remaining grated cheese and bake until golden brown, about 15 minutes longer. Let gratin stand 10 minutes and serve.

CELERY ROOT GRATIN



CELERY ROOT GRATIN image

Categories     Vegetable     Side     Bake     Thanksgiving     Vegetarian     Healthy

Yield 6 side dishes

Number Of Ingredients 10

1 1/2 pounds sweet potatoes
2 medium sized celery roots, peeled and sliced thin
1 leek, cleaned and sliced ready to saute
Olive oil
2-4 sprigs of thyme, leaves stripped off
salt and pepper
1/2-3/4 cups white wine
1/2 cup chicken stock
3/4 cup parmesan cheese
1 t butter

Steps:

  • Saute leeks in 2 tbsp olive oil, for about 10 minutes preheat oven to 375 Arrange half of sweet potatoes and celery root on bottom of a glass baking dish. Sprinkle half of thyme leaves and leeks on top, sprinkle with salt and pepper. Keep overlapping, and then cover with cheese. Poor white wine and chicken stock over veggies until it fills about halfway up the dish. If you need to add a little bit of water, that's fine. Drizzle with olive oil, some pats of butter, salt and pepper. Cover with foil and bake for 40 minutes. Take foil off, press veggies into juices with a spatula, and bake for another 30 minutes.

CELERY ROOT AND SQUASH GRATIN WITH WALNUT-THYME STREUSEL



CELERY ROOT AND SQUASH GRATIN WITH WALNUT-THYME STREUSEL image

Categories     Vegetable     Vegetarian

Number Of Ingredients 14

For the streusel:
1 cup panko
4 Tbspn unsalted butter
1/2 stick, melted
1/2 cup finely chopped walnuts
1 Tbspn finely chopped fresh Italian parsley
1 1/2 tspn fresh thyme leaves
1 tspn kosher salt
For the gratin:
1 1/4 cups heavy cream
1 medium butternut squash about 3 pounds, peeled, cut in half, and seeded
1 medium celery root, also known as celeriac about 1 pound, peeled and cut in half
2 Tbspn unsalted butter
1/2 medium white onion, thinly sliced

Steps:

  • For the streusel: 1. Combine all ingredients in a medium bowl and mix until butter is incorporated. Cover and place in the refrigerator until ready to use. For the gratin: 1. Heat the oven to 400°F and arrange a rack in the middle. Coat a 13-by-9-inch baking dish with butter and set aside. 2. Pour cream into a large bowl and set aside. Slice squash and celery root into 1/4-inch-thick pieces with a mandoline or sharp knife, placing pieces into the cream as they are cut. Toss until well coated. 3. Melt butter in a medium frying pan over medium heat. When it foams, add onion and season well with salt and freshly ground black pepper. Sauté until soft and translucent, about 5 minutes; set aside. 4. Construct gratin by ladling 1/3 of the squash and celery root mixture into the baking dish, then seasoning well with salt and freshly ground black pepper. Top with 1/2 of the onions, then another layer of squash and celery root. Season the second layer with salt and pepper and cover with the remaining onions. Place the last of the squash and celery root on top and press down to create an even surface. Season with salt and pepper, then pour the remaining cream over top. 5. Sprinkle streusel evenly over gratin. Bake until vegetables are soft and streusel is golden brown, about 40 to 50 minutes. 6. Let sit at room temperature for about 20 minutes before serving.

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