1. Preheat a grill for high heat.
2. In a medium bowl, lightly mix together the ground beef, Worcestershire sauce, liquid smoke and garlic powder. Form into 3 patties, handling the meat minimally.Over handling will make meat tough. Brush both sides of each patty with some oil, and season with salt and pepper.
3. Place the patties on the grill grate, and cook for about 5-8 minutes per side. Or until cooked to your liking. I sometimes cook these in an Iron skillet also.
2Saute sliced onion in butter in skillet until soft and done.
3To make grilled cheese put buttered bread 2 at a time in large skillet, brown both sides and add 2 slices cheese to each sandwich. Put grilled hamburger and sauteed onions inside 2 grilled cheese sandwiches.