This 8-ingredient Steak Sandwich Recipe is the ultimate hearty, satisfying meal! Tender shaved steak, caramelized onions, and gooey Monterey Jack cheese are all layered onto ciabatta with the best homemade lemon basil aioli (ever). Plus, everything is done in less than 20 minutes!
Heat a large non-stick pan to medium heat, add 1 tablespoon of olive oil, thinly sliced onion and ½ teaspoon of salt. Sauté for 5-7 minutes or until slightly caramelized, making sure to stir often not to burn. Remove to a bowl and set aside.
Bring the same pan to high heat, add remaining 1 tablespoon of olive oil, shaved steak and remaining 1 teaspoon of salt. Sauté until browned, about 5 minutes.
Remove from heat and add the onions back in and stir together.
Cut the ciabatta in 4 equal pieces and then in half, lightly toast it. Then add Lemon Basil Aioli on both sides, then add the meat on one side, top with a slice of cheese and toast for a few minutes in a toaster oven until cheese is melted.
Once cheese is melted, remove the sandwich and top with arugula, put the top piece of bread and cut in half. Enjoy!