Ingredients
1 tablespoon finely chopped onion1 tablespoon ketchup1 teaspoon prepared mustard1/4 teaspoon salt1/8 teaspoon pepper1/2 pound lean ground beef (90% lean)1/4 cup finely shredded cheddar cheese2 hamburger buns, splitOptional: Lettuce leaves and tomato slices
Preparation
In a small bowl, combine the first 5 ingredients. Crumble beef over mixture and mix lightly but thoroughly. Shape into 4 thin patties. Sprinkle cheese over 2 patties; top with remaining patties and press edges firmly to seal.
Grill burgers, covered, over medium heat 5-6 minutes on each side or until a thermometer reads 160°. Serve on buns, with lettuce and tomato if desired.
