This a recipe for a large group;  it makes 10 healthy servings.  It's wonderful for a picnic and works for vegans or anyone who enjoys healthy, tasty food and makes a very pretty dish when served in a large glass bowl.

Ingredients:

15-oz can kidney beans, drained & rinsed
15-oz can black beans, drained & rinsed
15-oz can garbanzo beans, drained & rinsed1/2 1  1/2 cup small red onion, sliced thin
1 bell pepper, chopped (any color)
1/2 cup corn, canned or frozen
1 small can of sliced water chestnuts

Dressing:
1/3 cup olive oil
1/4 cup red wine vinegar
1 tsp dijon mustard
1/2 tsp garlic salt
black pepper to taste
1 tsp. maple syrup, optional

Directions:

Combine the beans, onion, pepper, corn, and water chestnuts in a large bowl.
In a smaller bowl, whisk all the dressing ingredients together.  
Add the dressing to the larger bowl and  mix well.  Marinate in refrigerator 6-8 hours or overnight.