Pickle Slices Onion Slices Lettuce Leaves Tomato Slices Mix the ground beef and the salt and pepper together in a bowl, blending well. Shape into 4 patties about 1 cm thick. Place the patties on a grill 4 to 15 cm from the heat over grey-hot coals. Grill about 4 minutes on each side or to the desired doneness. Meanwhile, on the same grill in a small saucepan, melt the butter and add the 1 cup of sliced onion. Cook until crisp tender. Remove the onion with a slotted spoon and reserve. Stir the catsup and mustard into the butter left in the sauce pan and heat to serving temperature. When the hamburgers are done, place each one on a toasted bottom, and top first with some of the cooked onion and then a dollop of the catsup-mustard mixture and then garnish as desired. Makes 4 Hamburgers. Gloria Pitzer's Secret Recipe For: Harvey's Charcoal Broiled Burgers