1 (1 lb.) can French-style green beans
1 (1 lb.) can wax beans
1 (1 lb.) can kidney beans
1 medium onion, chopped
1/2 c. sugar
1/2 c. oil
1/2 c. vinegar
1/2 tsp. salt

Drain beans and combine with onions. Mix remaining ingredients and toss with vegetables. Cover. Marinate several hours or overnight. Drain before serving. Keep in the refrigerator.