Ingredients
Salsa
3 tablespoons red wine vinegar
1 tablespoon vegetable oil
1 chipotle chile in adobo, seeded and minced
3 plum tomatoes, finely diced
2 tablespoons red onion, finely diced
3 tablespoons chopped cilantro
Salt
Cheese Sauce
1 tablespoon unsalted butter
1 tablespoon all-purpose flour
1 1/2 cups milk
1/2 pound Monterey Jack cheese, shredded
2 tablespoons freshly grated pecorino cheese
Salt and freshly ground pepper
Burgers
1 1/2 pounds ground beef chuck
Vegetable oil, for brushing
Salt and freshly ground pepper
4 hamburger buns, split and toasted
Sliced pickled jalapeños and blue corn tortilla chips, for topping
Preparation
1.MAKE THE SALSA In a bowl, combine all of the ingredients and season with salt. 2.MAKE THE CHEESE SAUCE In a small saucepan, melt the butter. Stir in the flour and cook over moderate heat for 30 seconds. Whisk in the milk and cook, whisking, until smooth and thickened, 5 minutes. Stir in the Jack cheese until melted, then stir in the pecorino; season with salt and pepper. Let the sauce cool until it is very thick and spreadable. 3.MAKE THE BURGERS Light a grill. Form the beef into 4 patties and brush with oil; season with salt and pepper. Grill over moderately high heat until browned outside and medium within, about 4 minutes per side. 4.Place the burgers on the buns. Top with the cheese sauce, salsa, pickled jalapeños and chips. Close the burgers and serve
