Ingredients
- 1 large yellow onion, halved and sliced thin
- 1 tablespoon canola oil
- 1/4 teaspoon salt
- 2 tablespoons butter
- 2 tablespoons flour
- 1/2 cup milk
- 1/2 cup shredded cheese (American, cheddar, mozzarella, or provolone)
- Pinch cayenne pepper
- 1 tablespoon canola oil
- 1 skirt steak (about 1 pound), at room temperature
- 16 big butter lettuce leaves
- Pickled pepper rings, to garnish
Preparation
Make caramelized onions: Heat the oil in a large skillet set over medium- high heat and add the onions and salt. Cook, stirring frequently, until the onions have become soft and translucent, about 10 minutes.
Turn the heat to medium-low and continue cooking, partially covered, stirring occasionally until the onions are light brown, about 15 more minutes. Remove from the heat into a bowl or storage container.
Make the cheese sauce: In a small pot, melt the butter over medium heat. Add the flour and cook, stirring, until the flour is no longer raw, about a minute. Slowly pour in the milk, whisking as you go to avoid lumps, and bring the mixture to a boil. Simmer until thick enough to coat the back of a spoon, about 2 minutes, and remove from the heat. Add cheese and cayenne, and stir until melted.
Make the steak: Season the steak well with plenty of salt. In a castiron skillet set over high, heat the canola oil until smoking. Add the steak and cook, undisturbed, until it is browned, about 2 minutes. Flip, and cook on the other side until brown and the steak is medium-rare, about 2 minutes more. Transfer to a cutting board and let rest for 10 minutes before slicing thin against the grain.
To make the lettuce cups, add a few slices of steak to a butter lettuce leaf and top with caramelized onions, a drizzle of cheese sauce, and a few pickled pepper pieces. Serve immediately.