Yellow Wax Bean and Radish Salad with Cannellinis

dried cannellini beans (12 ounces), soaked overnight and drained

small yellow onion, peeled and halved

small carrot

small celery rib

yellow wax beans

extra-virgin olive oil

red wine vinegar

freshly squeezed lemon juice

Salt and freshly ground black pepper

large radishes, sliced 1/4 inch thick

small red onion, thinly sliced

small basil leaves or chopped basil