Start by browning the ground beef in a large pot over medium-high heat. Drain off the fat.
Add in the green peppers and onions. Stir, and then add 1 cup water, the ketchup and garlic. Stir it around to combine, and then add the brown sugar, chili powder, dry mustard, red pepper flakes, and hot sauce, Worcestershire, salt and pepper to taste. Stir to combine, and then cover and simmer over medium-low heat, about 20 minutes.
To serve, spread the rolls with the butter and brown them on a griddle or in a skillet. Spoon a good amount of the meat mixture onto the bottom roll, and then top with the other half. Serve with chips, salad or just enjoy it by itself.