Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2 1/2  Pounds        ground beef -- lean
   1                    onion -- large,quartered
   1      Cup           ketchup
   1      Teaspoon      chili powder
   1      Teaspoon      dry mustard
   1      Teaspoon      salt
   2      Cups          beef broth -- or water
   8                    hamburger rolls -- toasted

Preparation:

In skillet, brown ground beef; drain well. Place browned beef and remaining ingredients except hamburger rolls in crock-pot. Cover and cook on LOW setting for 6 to 12 hours. Taste for seasoning before serving. Serve spooned over toasted hamburger buns. 6 to 8 servings (About 2 quarts)