3-Bean Salad

1 can yellow string beans, drained
1 can green string beans, drained
1 can red kidney beans, drained

1 med onion, diced
2 med green peppers, diced

(mix)

1 can tomato soup
1/2 c. salad oil
1 c. sugar
3/4 c. vinegar
1/2 tsp salt, 1/2 tsp white pepper
1 tsp mustard

(blend)

Pour over beans, refrigerate overnight.