2 onions, thinly sliced (about 2 cups)
1 lb. lean ground beef
1 Tbsp. LEA & PERRINS Worcestershire Sauce
1/2 tsp. garlic powder
1/2 tsp. ground black pepper
1/2 tsp. onion powder
4 KRAFT Big Slice Sharp Cheddar Cheese Slices
1/4 cup KRAFT Real Mayo Mayonnaise
1 Tbsp. A.1. Original Sauce
4 pretzel sandwich rolls (2-1/2 inch), split
Heat grill to medium-high heat. Heat oil in large skillet on medium-low heat. Add onions; cook 10 to 15 min. or until golden brown, stirring frequently. Meanwhile, mix meat, Worcestershire sauce and dry seasonings just until blended; shape into 4 (1/2-inch-thick) patties. Make indentation in center of each patty with your thumb. Grill 5 min. on each side or until done (160ºF), topping with cheese for the last 2 min. Mix mayo and A.1. until blended; spread onto bottom halves of rolls. Fill rolls with burgers and onions.