Gourmet Steak Sandwich

Ingredients

• Steak (ribeye or sirloin) (1 pound)
• Salt (to taste)
• Black pepper (to taste)
• Olive oil (2 tablespoons)
• Onion (1 large, thinly sliced)
• Provolone cheese (4 slices)
• Ciabatta bread (2 large rolls)
• Tomato (1 large, sliced)
• Lettuce (a handful of leaves)
• Dijon mustard (2 tablespoons)
• Mayonnaise (2 tablespoons)

Instructions

1. Preheat the grill or grill pan to medium-high heat.
2. Season the steak generously with salt and black pepper on both sides.
3. Grill the steak for about 4-5 minutes per side, or until it reaches your desired doneness. For medium rare, aim for an internal temperature of 130°F (54°C). Let it rest for a few minutes, then slice it thinly against the grain.
4. In a skillet, heat the olive oil over medium heat. Add the sliced onions and cook, stirring occasionally, until they are deeply caramelized, about 10-15 minutes. Season with salt and pepper to taste.
5. In a small bowl, mix together the mayonnaise and Dijon mustard to create a tangy aioli sauce.
6. Slice the ciabatta rolls in half horizontally. Spread the aioli sauce generously on one side of each roll.
7. Layer the sliced steak, followed by the caramelized onions, provolone cheese, lettuce, and tomato on one half of the roll. Top with the other half of the roll.
8. Heat a panini press or skillet over medium heat. Place the sandwich in the press or skillet and cook for 3-4 minutes on each side, until the bread is toasted and the cheese is melted and gooey.
9. Remove from heat, slice the sandwich in half, and serve hot with your favorite side.