Grilled Burgers with Roquefort Mayonnaise and Barbecued Red Onions

• 8 1/2-inch-thick slices red onions
• 1 1/3 cups bottled hickory-flavored barbecue sauce
• 3 pounds ground round beef, formed into eight 4- to 5-inch-diameter patties
• 8 4- to 5-inch-diameter hamburger buns, split
• Roquefort Mayonnaise

1. Prepare barbecue (medium heat).
2. Brush onions generously with barbecue sauce.
3. Grill until onions are tender, brown and glazed, basting with barbecue sauce and turning occasionally, about 15 minutes.
4. Sprinkle patties with salt and pepper.
5. Grill patties until cooked through, about 5 minutes per side.
6. Grill hamburger buns, cut side down, until lightly toasted, about 2 minutes.
7. Place patties on bottom halves of buns.
8. Top each with 1 onion slice, Roquefort Mayonnaise, then bun tops.

red onions, barbecue sauce, ground round beef, buns, mayonnaise

Taken from www.epicurious.com/recipes/food/views/grilled-burgers-with-roquefort-mayonnaise-and-barbecued-red-onions-5482 (may not work)