BASIL BEAN SALAD

1 15oz can kidney beans - rinsed and drained
1 15oz can garbanzo beans - rinsed and drained
1 15oz can black beans - rinsed and drained
1 15oz can whole pitted black olives - drained
1 med. green pepper - thinly sliced
3 green onions - thinly sliced 
1/2 cup balsamic vinegar
1/2 cup olive oil
6 Tbl sugar
1 Tbl chopped fresh basil
3/4 tsp. round mustard

In a large bowl combine all ingredients and chill for 5 hours.