Combine beans, onion, celery, and clove in a large pot. Add enough water to cover by two inches. Cover the pot and place it in the Sun Oven.
Cook until beans are tender, about 1 ½ hours. Drain beans, remove and discard clove. Mash bean and vegetable mixture, add salt to taste.
When mixture is cool and you’re ready to fry the patties, mix in the egg yolks, bread crumbs, and parmesan cheese.
Heat the oil in a large frying pan. Shape bean mixture into small patties. Dip each patty in the egg whites, coat with bread crumbs and fry in batches.
Drain patties on paper towels and keep warm as you continue frying. Just before serving squeeze lemon onto the warm patties. Serve with lemon wedges.