Servings: 8

2 1/2 pounds lean ground beef
1 large onion, peeled and quartered
1 cup ketchup
1 teaspoon chili powder
1 teaspoon dry mustard
1/2 teaspoon salt
2 cups beef broth or water
8 hamburger buns, toasted

In a skillet, brown and crumble ground beef; drain well. Place beef and remaining ingredients except hamburger rolls in a crockpot. Cover and cook on LOW for 6 to 12 hours. Taste for seasoning before serving and correct if necessary. Spoon over toasted hamburger buns.