2 pkgs. frozen French cut green beans
1 can waterchestnuts, chopped
1 onion (yellow or white), chopped
2 tbsp. butter
1 tbsp. sugar
1 tsp. salt
1 tsp. vinegar (most any kind)
1 c. sour cream

Combine all ingredients together in medium saucepan except sour cream. Simmer until onions are tender, approximately 20 minutes. Remove from heat. Just before serving, add sour cream.