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.