Bistro Cheeseburgers

• 1 12 lbs ground beef
• 4 slices sweet onions, 1/2 in. thick
• 8 slices swiss cheese
• 14 cup mayonnaise
• 1 tablespoon Dijon mustard
• 4 crusty rolls, split and toasted
• 4 slices cooked crisp bacon, halved
• tomatoes, sliced
• lettuce

1. Preheat grill to medium.
2. Lightly shape ground beef into four 3/4-inch thick patties.
3. Brush onion slices with vegetable oil.
4. Place patties in center of grid; surround with onions.
5. Grill, uncovered and turning occasionally, 13 to 15 minutes for medium doneness (internal temp 160F) or until patties are no longer pink in center and onions are tender.
6. Season with salt and pepper to taste.
7. About 1 minute before patties are done, top each with 2 cheese slices.
8. Combine mayonnaise and mustard; spread on top halves of rolls.
9. Serve burgers and onion in rolls with lettuce, tomato and crisp cooked bacon slices.

ground beef, sweet onions, swiss cheese, mayonnaise, mustard, crusty rolls, bacon, tomatoes

Taken from www.food.com/recipe/bistro-cheeseburgers-177556 (may not work)