Ropa Vieja Burgers

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2 tablespoons unsalted butter

2 large onions, chopped

2 red bell peppers, chopped

1 teaspoon tomato paste

1 tablespoon minced garlic

3 cups canned crushed tomatoes

1 tablespoon hot sauce

1 tablespoon fresh lemon juice

2 tablespoons seafood boil seasoning, such as Old Bay

2 pounds ground beef

Kosher salt and freshly ground black pepper

8 slices muenster cheese

4 Kaiser rolls or artisan hamburger buns, split

1/2 cup mayonnaise

1 cup fried onions (canned is fine)