Croissant Steak Sandwiches with Caramelized Onions and Horseradish Mayonnaise
Epicurious.com
Epicurious.com
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Ingredients

  • 1/2 cup mayonnaise
  • 1/4 cup prepared white horseradish
  • 4 tablespoons (1/2 stick) butter, divided
  • 3 1- inch-thick beef tenderloin steaks
  • 3 medium onions, thinly sliced
  • 8 ounces large shiitake mushrooms, stemmed, caps thinly sliced (about 5 cups)
  • 1 cup beef broth
  • 4 large croissants, halved horizontally, lightly toasted
  • 2 cups arugula

Instructions

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