Steak sandwich

Ingredients:

Meat

• 1 New York striploin steak, 340g, 2.5cm thick.
• Olive oil
• 2 onions, sliced ​​into rings
• 0.5 tsp fresh thyme leaves
• 1 serving mustard mayonnaise, recipe below
• 2 mini focaccias, cut in half horizontally
• 0.5 cup finely chopped arugula or cheese

Mustard mayonnaise

• 3/4 cup good quality mayonnaise
• 1 tbsp Dijon mustard
• 1 tbsp. grainy mustard
• 2 tbsp sour cream
• 1/8 teaspoon coarse salt
• Mix all ingredients in a small bowl.

Preparation:

1. Season the steak generously with salt and black pepper on both sides. Heat 1 tablespoon of olive oil in a medium skillet over high heat until it begins to smoke. Then sear the steak for 1 minute on each side. Reduce the heat to low and cook for about 7-10 minutes, turning once, until medium-rare. Transfer the steak to a plate, cover tightly with foil, and let rest for 10 minutes. Slice the meat into strips.
2. In the same skillet, heat 1.5 tablespoons of olive oil over medium heat. Add the onion and thyme and cook for 10 minutes, stirring occasionally, until the onion is browned.
3. To assemble the sandwiches, spread 1 tablespoon of mustard mayonnaise on the bottom half of each bun. Layer the steak strips on top of the mayonnaise, season with salt and black pepper, and top with caramelized onions. Garnish with chopped arugula or cheese.