Five Bean Salad - cooking recipe

Ingredients

1 (15 ounce) can green beans
1 (15 ounce) can wax beans
1 (15 ounce) can lima beans
1 (15 ounce) can kidney beans
1 (15 ounce) can garbanzo beans (chickpeas)
1 onion, chopped (I add the next day about an hour before serving, other wise it seems too strong)
1 green pepper, chopped (my grandmother's recipe calls for this but we never put it in as we don't care for it)
1/2 cup vegetable oil
1/2 cup vinegar
3/4 cup sugar
1 teaspoon salt
1 teaspoon pepper
1 teaspoon dry mustard
1 -2 teaspoon celery seed

Preparation

Drain all the beans and combine in a large bowl.
Heat (but do not boil) (I do it in the microwave for about 1 minute) vegetable oil, vinegar, sugar, salt, pepper, dry mustard, and celery seed.
Mix with bean mix and let stand overnight.
Add onion/pepper about an hour before serving.