1) Preheat griddle or frying pan. 2) Toast both halves of hamburger bun, face down. Set aside. 3) Form ground beef into patty slightly larger than bun. Use burger press for best results. 4) Cook patty 2 to 3 min. Per side. 5) Build burger in following stacking order from bottom up: bottom bun-beef patty-onion rings-pickles-tomato slice-lettuce leaf- mayonaise-catsup-top bun.