Preparation Time: 0:50 Preheat the oven to 350 degrees. Saute the onion and celery in the water about 10 minutes. Combine in a bowl with the remaining ingredients and mix well. Form into patties and place on a nonstick baking sheet. Bake for 20 minutes, then turn and bake for an additional 20 minutes Serve hot on toasted whole wheat burger buns.