BEEF TENDERLOIN SANDWICHES WITH SPICY MUSTARD

Steps:

• Coat steaks all over with peppercorns. Cover and refrigerate for 30 minutes, or up to 24 hours.
• Mix mayonnaise, mustard, and horseradish together in a small bowl. Cover and refrigerate with steaks.
• When ready to cook, toss mushrooms and lemon juice together in a medium bowl until mushrooms are evenly coated. Sprinkle lightly with salt.
• Generously brush a large, heavy skillet with oil and heat over medium-high heat. Add steaks and cook to desired doneness, about 5 minutes per side for medium-rare. An instant-read thermometer inserted into the center should read 130 degrees F (54 degrees C). Transfer steaks to a plate and let stand for 15 minutes before slicing thinly.
• After the steaks have sat for about 5 minutes, place bacon in the same skillet and cook over medium-high heat, turning occasionally, until brown and crisp, about 10 minutes. Use tongs to transfer bacon to paper towels to drain.
• Place roll bottoms on plates. Spread with mustard dressing. Divide sliced steak among rolls. Top with bacon, mushrooms, and arugula, then cover sandwiches with roll tops.