Croissant Steak Sandwiches With Caramelized Onions and Horseradi

Total Time
Prep 10 mins
Cook 40 mins

My family loves these sandwiches. We also make them with leftover flank steak, or any other leftover meat.

Ingredients Nutrition


  1. Mix mayonnaise and horseradish in small bowl to blend.
  2. Melt 1 tablespoon butter in heavy large skillet over medium-high heat. Sprinkle tenderloin steaks with salt and pepper. Add steaks to skillet and cook to desired doneness, about 5 minutes per side for medium-rare. Using tongs, transfer steaks to work surface.
  3. Melt 3 tablespoons butter in same skillet over medium-high heat. Add onions; sauté until dark brown, about 25 minutes. Add mushrooms; sauté until tender, about 5 minutes. Add broth; boil until juices are reduced to glaze, stirring occasionally, about 1 minute. Season onion mixture to taste with salt and pepper.
  4. Place 1 croissant bottom, cut side up, on each of 4 plates. Spread each with horseradish mayonnaise and top with 1/2 cup arugula. Thinly slice steaks and divide among croissants. Top with onion mixture. Spread remaining mayonnaise on cut side of croissant tops. Place tops on sandwiches.


Most Helpful

Great steak sammie! I made my own croissants and I also added provolone cheese. These were a very filling dinner and super easy to make. Thanks Lazyme for an awesome dinner!

NcMysteryShopper January 26, 2007

Made these for dinner last night with some leftover flank steak and they were outstanding. I love steak with mushrooms and onions so I knew I couldn't go wrong with this recipe. The horseradish gives it that extra kick and my husband loved it. The croissants I got from a local bakery were a perfect buttery accompaniment. Thanks for such a great recipe!

Lainey6605 December 20, 2006

Join the Conversation

  • all
  • reviews
  • tweaks
  • q & a