CELERY ROOT AND POTATOES DAUPHINOISE

Steps:

• Preheat oven to 375 degrees.
• Peel and slice the potatoes and celery root thin, which can be done in a food processor. Rub one or two gratin dishes with the garlic; butter them, and then arrange the slices of potato and celery in layers, adding a little butter, salt, pepper and thyme to each row as you go. Top with the cream, salt and pepper and bake until the vegetables are tender (about 45 minutes to an hour) and the top is browned and bubbling.