Diced onions, relish, mustard, ketchup, sliced pickles, sliced tomatoes and shredded lettuce, for topping
Preheat a grill to medium and brush the grates with vegetable oil. Season the beef with salt and pepper and form into four 1/2-inch-thick patties; make a small indentation in the top of each patty using your finger or a small spoon.
Grill the burgers about 6 minutes per side for medium well. Top each with a slice of cheese and let melt, about 2 more minutes. Meanwhile, lightly toast the buns on the grill.
Serve the burgers cheese-side down on the buns; top with onions, relish, mustard, ketchup, pickles, tomatoes and lettuce.
Photograph by Steve Giralt
Recipe courtesy of Fatburger for Food Network Magazine