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1 lb very lean ground sirloin
1 small tomato, finely chopped
1 medium onion, finely chopped
1 small green bell pepper, finely chopped
1/2 tsp freshly ground black pepper or to taste
1 tsp Worcestershire sauce
Vegetable oil spray
6 whole-wheat hamburger buns
1 large tomato, sliced
6 lettuce leaves
Mustard to taste
Ketchup to taste