Ham barbecue sandwiches

Ingredients

 * 1 1/2 lbs Cooked Ham, Chopped
 * 1 1/2 cup Ketchup
 * 2 tbsp Cider Vinegar
 * 1 tbsp Brown Sugar, Packed
 * 1 tbsp Prepared Mustard
 * 1 tbsp Worcestershire Sauce
 * 8  Frankfurter Rolls

Directions
1 Combine all of the ingredients, except the frankfurter rolls, in a 2-quart saucepan. 2 Cook over medium heat until the mixture comes to a boil, then remove from the heat and cover; refrigerate until serving time. 3 To grill: place each frankfurter roll on a 10-inch length of heavy-duty foil. 4 Fill each roll with about 1/3 cup of the ham mixture. 5 Securely wrap each roll into a loose packet. 6 Grill 4-inches from grey coals (medium heat). 7 Cook for 20 minutes, turning often with tongs