Chipped Ham Barbecue
["1 lb. chipped ham", "2 Tbsp. vinegar", "2 Tbsp. water", "4 tsp. sugar", "1/2 tsp. dry mustard", "8 Tbsp. ketchup", "1 Tbsp. butter"]
["Heat the ham in a skillet with the butter.", "Mix the remaining ingredients in a bowl.", "Pour the mixture over the ham and mix. Simmer for 5 minutes.", "Serve on buns."]
["ham", "vinegar", "water", "sugar", "dry mustard", "ketchup", "butter"]