Bistro Burger

• 1 lb. (450 g) extra-lean ground beef
• 4 Cheddar Cheese Slices
• 4 thick onion slices
• 4 hamburger buns
• 3 Tbsp. Mayonnaise
• 1 Tbsp. Dijon mustard
• 1 tsp. horseradish

To Make:

1. Heat barbecue to medium-high heat.

2. Shape meat into 4 (1/2-inch-thick) patties.

3. Grill 4 to 6 min. on each side or until done (160°F). Top with cheese; grill 1 min. or until melted. Meanwhile, place onions and buns, cut-sides down, on grill; cook 1 to 2 min. or until onions are lightly browned and buns are lightly toasted, turning onions once.

4. Mix remaining ingredients; spread onto bottom halves of buns. Fill buns with cheeseburgers and onions.