My friend Sarah shared this recipe with me that she found and it is so good. I doubled the original, so check the site for a regular version of it.
3# ground beef
¾ cup chopped onion
¾ cup chopped green bell pepper
1½ tsp garlic powder
3 tsp yellow mustard
2¼ cups ketchup
3 tbsp brown sugar
2 tsp salt
2 tsp black pepper
In a pot over a medium heat, brown the ground beef, onion, and bell pepper; drain off the liquid.
Stir in the garlic powder, mustard, ketchup and brown sugar; mix thoroughly. Add salt and pepper to taste.
Reduce heat and simmer for 30 minutes.