Bean Burgers

Makes 6 burgers

1 cup cooked garbanzo beans
1 cup cooked brown rice
1/2 cup quick-cooking oats
1 celery stalk, finely chopped
1 small onion, finely chopped
1 garlic clove, minced
2 tablespoons reduced-sodium soy sauce
1 teaspoon paprika
1/4 teaspoon black pepper
vegetable oil spray
6 whole-wheat burger buns
6 tablespoons Tofu Mayo (see recipe) or other dairy- and egg-free mayonnaise substitute
6 tablespoons stone-ground mustard
6 tablespoons ketchup
6 tomato slices
6 red onion slices
6 lettuce leaves