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Peppered Steak Sandwiches with Caramelized Onions and Light Horseradish Sauce

WebMD Recipe

Peppered Steak Sandwiches with Caramelized Onions and Light Horseradish Sauce


  • 3 1-inch thick filet mignon steaks (beef tenderloin steaks), about 1 1/4 pounds total
  • 2 teaspoons canola oil, divided use
  • 1 large sweet onion (or 2 small ones), cut in half and thinly sliced
  • 2 cups sliced mushrooms, like crimini, portabello, or white button
  • 1/2 cup water, or low-sodium beef broth
  • 2 1/2 tablespoons light mayonnaise
  • 2 teaspoons white (or creamed) horseradish
  • 4 French, sourdough, or submarine rolls (part whole-wheat, if available)
  • salt and pepper


Step 1
 Add a teaspoon of canola oil to a medium nonstick frying pan or skillet, and let it get nice and hot over medium-high heat. Meanwhile, salt and pepper both sides of each steak (heavier on the pepper than the salt). Add steaks to the pan, and cook to desired doneness (about 5-6 minutes per side for medium-well). Use a fork to remove steaks to a plate (keep the steak juices in the pan for use later).
Step 2
Add the remaining teaspoon of oil to a large, nonstick skillet and sauté the onion slices over medium-high heat until golden (about 5 minutes). Add the mushroom slices, 1/2 cup broth or water, and all the juices from the steak pan. Continue to cook the onions and mushrooms, stirring often, for about 5 minutes. Remove from heat.
Step 3
 Put light mayonnaise and horseradish in a custard cup and stir to blend well.
Step 4
Place the bottoms of your sandwich rolls on a serving plate. Spread horseradish sauce on top of each. Top each with steak slices and the onion/mushroom mixture, then place tops on the sandwiches.

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