Smoky Double Cheeseburger

1 egg lightly beaten
1/2 c. soft bread crumbs
3 oz. smoked cheddar cheese, finely shredded
2 tbsp. worcestershire sauce
1 tbsp. dijon-style mustard
1/4 tsp. ground black pepper
1 1/4 lb. ground beef
4 1/4  to 1/2 inch onion slices
4 hamburger buns
1/4 c. mango chutney or cranberry relish
1/2 c. lettuce or spinach leaves
1 to 2 oz. Asiago or Parmesan

In a large bowl combine egg, bread crumbs, smoked cheddar, green onions, Worcestershire sauce, mustard, and pepper. Add ground beef and mix gently. Firmly shape into 4 1/2 inch patties; set aside.

Grill onions for 6-8 minutes until tender, turning once. Remove from grill. Add patties to grill. Cook for 9-12 minutes or until meat is done, turning once.

Spread bottoms of hamburger buns with chutney or relish, top with lettuce, patties, onion slices, if using, shaved cheese and bun top.