This recipe uses tofu that has been frozen for 72 hours and then quickly defrosted. Onion, celery and cheese make these burgers delicious. This is a family favorite at the Silverwolfs' den. Serve in place of meat as a main entree or place on a bun along with your favorite toppings: lettuce, onion, tomato, mayo, etc. These burgers can also be baked in an oven preheated at 350 degrees for 30 minutes rather than frying.