Rach on the Radio - Double Bacon Burgers

Double-Bacon Burgers with Maple-Worcestershire Onions

• 12 slices good-quality smoky bacon, divided
• EVOO – Extra Virgin Olive Oil, for drizzling
• 2 tablespoons butter
• 1 large onion
• Coarse salt and coarse black pepper
• 1/2 cup cloudy apple cider
• 1/4 cup dark amber maple syrup
• 3 tablespoons Worcestershire sauce
• 1 1/2 pounds ground beef sirloin
• 2 tablespoons grainy mustard
• 8 large, thin slices Gruyère or sharp cheddar cheese
• 4 brioche buns, sliced