Calico Salad

 

Here is the dish that I made for the potluck meeting at the library tonight. People like it and ask for the recipe.
Calico Salad

1 16 oz. pkg. frozen mixed vegetables
1 small chopped onion
1 cup chopped celery
1 can red or black beans
Sauce:
1 cup sugar
2 tablespoons flour
1/2 cup apple cider vinegar
1 tablespoon prepared mustard

Mix flour with sugar, add vinegar and cook while stirring until thickened. Add mustard. Pour over vegetables and refrigerate for at least two hours.