This summer salad is based on the Southern favorite, succotash, and is a fresh-tasting combination of butter beans, corn, summer squash and tomatoes. Butter beans, the same species as lima beans, are the bean of choice in the South. When they're in season you may be able to find them fresh--shell them yourself. Or use frozen butter beans, baby lima beans or even edamame. Download a Free Cookbook with Our Best Summer Recipes!