In a large bowl, mix the 3 different types of beans, the celery, onion (drained of soaking water), parsley, and rosemary.
In a separate small bowl, whisk together the vinegar, sugar, olive oil, salt, and pepper. Add the dressing to the beans. Toss to coat.
Transfer the salad to the refrigerator for several hours, to allow the beans to soak up the flavor of the dressing. Let come to close to room temperature to serve. Did you enjoy this recipe? Let us know with a rating and review!
