small onion, diced
2 tbsp. oil or Crisco
1 c. catsup
2 tbsp. vinegar
2 tbsp. brown sugar
1 tsp. mustard
1/2 c. water
1 lb. chipped ham

Sauté onions in oil until transparent; add remaining ingredients and cook on low 30 to 45 minutes, stirring often. You can also double this and cook in crock-pot on low for 3 to 4 hours. (You can adjust sugar or vinegar to taste; I like a little more sugar and brown sugar, too.)