Brown 1 pound of ground beef in a skillet with some butter. Remove and drain the beef when browned.
Add diced green bell pepper, yellow onion, and minced garlic to the same skillet.
Let the pepper, onion, and garlic cook for 3-4 minutes until softened. Then add water, Worcestershire sauce, ketchup, tomato paste, brown sugar, yellow mustard, salt, pepper, red pepper flakes, and hot sauce.
Mix everything together and add the ground beef.
Let the mixture simmer for 10 minutes and grate in some gruyere cheese.