French Onion Steak Sandwich Recipe

Preparation Steps

1. 1

   Caramelize the Onions

   In a skillet, heat 1 tablespoon of olive oil over medium heat. Add thinly sliced onions and a pinch of salt. Cook slowly, stirring occasionally, until the onions are golden brown and caramelized (about 20-25 minutes).

2. 2

   Cook the Steak

   Season the sirloin steak with salt and pepper. In the same skillet, add another tablespoon of olive oil and increase the heat to medium-high. Sear the steak for about 4-5 minutes on each side for medium-rare, or until desired doneness. Remove from skillet and let rest before slicing.

3. 3

   Prepare the Aioli

   In a small bowl, combine mayonnaise, Dijon mustard, and a pinch of salt. Mix well until smooth.

4. 4

   Assemble the Sandwich

   Slice the French rolls in half and spread the Dijon aioli on both sides. Layer with arugula, sliced steak, caramelized onions, and top with gruyere cheese.

5. 5

   Melt the Cheese

   If desired, place the assembled sandwiches under a broiler for 2-3 minutes until the cheese is melted and bubbly.

6. 6

   Serve

   Cut the sandwiches in half and serve with dressed greens on the side.