Divide mixture into 4 equal portions, shaping each into a 1/2\" thick patty.
Coat a grill rack with cooking spray; place on grill over hot coals.
Place patties on rack, and cook 4 minutes on each side or to desired degree of doneness.
Line bottom half of each bun with a lettuce leaf; top with a patty, tomato slice, onion rings, and top half of bun.
Repeat procedure with remaining ingredients.
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