Mix some ground meat with a little tomato sauce to moisten and coat; add onions, black and/or red pepper and salt (+whatever, to taste, eg, a little minced black olive); spread mixture on half hamburger bun, top with grated cheese of choice; toast briefly under broiler or in toaster oven till cheese melts and topping is hot and just crusty. (If using oven broiler, be careful as the burger buns burn very quickly. I suggest leaving the oven door open for the short time it takes to set these, and keeping an eye on them.) P.S. I'd make sure meat is cooked before serving.