Thinking of a picnic? This is the perfect side dish that you can make ahead. You can also substitute your favorite type of bean. I've also made it with chickpeas and they add a nice crunch.
3 Bean Salad
1 can cut green beans, drained & rinsed
1 can wax beans, drained & rinsed
1 can dark red kidney beans, drained & rinsed
1 small purple onion, sliced
1/2 cup canola oil
1/2 cup sugar
1/2 cup apple cider vinegar
1/2 teaspoon coarse black pepper
Mix oil, sugar, vinegar & pepper in a large bowl. Add beans and onion. Toss well. Refrigerate at least 2 hours tossing occasionally.