Here is a typical recipe for sloppy joes.
1 pound lean ground beef
1/4 cup chopped onion
1/4 cup chopped green bell pepper
1/2 teaspoon garlic powder
1 teaspoon prepared yellow mustard
3/4 cup ketchup
3 teaspoons brown sugar
salt to taste
ground black pepper to taste

Brown and drain ground beef. Add remaining ingredients to cooked ground beef.
Cook over low heat for 30 minutes or more. Serve on hamburger buns or kaiser
rolls.