In a skillet, brown ground beef over medium heat until meat is browned and crumbling. Cook until no pink remains. Drain grease.
Add onion, green peppers and garlic. Cook until vegetables are soft
Stir in the remaining sauce ingredients. Simmer for 20 minutes uncovered.
While the sauce is simmering, toast the bun by preheating the oven to broil. Brush the inside of the hamburger buns with butter or olive oil and place on a baking sheet. Broil 1-3 minutes or just until lightly browned.
Spoon meat over the bread to make a delicious sandwich.
Notes
To freeze, cool completely and place in a freezer bag. Keep frozen for up to 3 months. Thaw in the fridge overnight and reheat on the stove or in the microwave.