In a medium bowl, stir together the ketchup, chili sauce, water, vinegar, brown sugar, chili powder, cumin, mustard, worcestershire and tomato paste and set aside.
Heat the butter in a large skillet over medium heat and add the onion and bell pepper and cook until softened, about 3 – 5 minutes. Add the garlic and cook another minute or two.
Increase the heat to high, add the ground beef and cook until browned, breaking it up well with a wooden spoon as it cooks. Drain off the excess fat.
Stir in the liquid mixture, generously salt and pepper and bring to a boil, then reduce the heat and simmer for about 15 minutes, or until thickened.
Serve on toasted hamburger buns with mustard, pickles and cheese if you want.
Source:
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