1 can cream of mushroom soup
1 (8 oz.) pkg. cream cheese
3/4 c. mayonnaise
1/2 c. onion, finely chopped
1/2 c. celery, finely chopped
1 (6 1/2 oz.) can tuna, drained
1 pkg. Knox unflavored gelatin
3 tbsp. water

Place soup and cream cheese into a saucepan and heat. Stir until mixed well. Add mayonnaise, onion, celery and tuna. In separate dish, mix gelatin and water until smooth. Add to mixture in saucepan. Stir well. Oil mold or spray with Pam. Pour in mixture and let set overnight. To remove mousse from mold: Sit mold in warm water, only until loose from sides (30 seconds). Place mold onto decorative platter and serve with crackers.