French Onion Soup Burgers
Ingredients:
1 pound ground beef
1 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon Worcestershire sauce
2 large onions, thinly sliced
2 tablespoons butter
1 tablespoon olive oil
1 teaspoon sugar
1 cup beef broth
4 slices Swiss cheese
4 brioche buns, toasted
Fresh parsley, chopped (for garnish)
Instructions:
Caramelize the Onions:
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