1 can cream of mushroom soup
2 (8 oz.) pkgs. cream cheese
1 sm. onion, chopped
2 env. Knox gelatin
1/2 c. hot water
1 c. chopped celery
12 oz. tuna
1 c. mayonnaise

Melt in saucepan: soup, cream cheese and onion. Dissolve gelatin in 1/2 cup of hot water. Add this to the cream cheese mixture, also celery, tuna and mayonnaise. Mix above well. Pour into a mold -- unmold and serve on platter with crackers. Spread mousse on crackers and enjoy!!