Patty Melt

Name: Patty Melt
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Yield: 2
Ingredients: Ingredients; 1 pound ground beef (80/20 lean-to-fat ratio); 1 large yellow onion, thinly sliced; 1 tablespoon butter (for onions); 1 tablespoon olive oil (for onions); 4 slices rye bread (or sourdough or your preferred bread); 4 slices Swiss cheese (or cheddar, or American cheese); 2 tablespoons butter (for grilling the sandwich); Salt and pepper to taste; 1 tablespoon Worcestershire sauce (optional, for extra flavor)