Step 1

In a large skillet, start the olive oil over medium heat.

Step 2

Toss in the bell peppers and onions, then cook until tender, maybe 10 minutes.

Step 3

Place the ground beef in the skillet and cook until browned, breaking it up with a spatula as you go.

Step 4

Mix in the beans, tomatoes, brown sugar, vinegar, and tomato paste.

Step 5

Add salt and pepper to taste, and simmer for 10 to 15 minutes.

Step 6

Place generous scoops of meat on the warmed hamburger buns.