Bacon Cheeseburger with Maple Onions - Fuller’s Sugarhouse

Ingredients

• 12 slices good-quality smoky bacon
• for drizzling Olive Oil
• 2 T. Butter
• 1 large onion, chopped or thinly sliced
• to taste coarse salt and pepper
• 1/2 C. cloudy apple cider
• 1/4 C. Fuller’s Sugarhouse dark maple syrup
• 3 T. Worcestershire sauce
• 1 1/2 lb. ground beef sirloin
• 2 T. grainy Dijon mustard
• 8 large thin slices gruyere or sharp cheddar
• 4 brioche buns, split