Chopstick Tuna

1 can cream of mushroom soup
1 (3 ounce) can chow mein noodles
1/4 cup onion, chopped
1 can tuna
1/4 can water
1/2 cup salted cashew nuts
1 cup celery, chopped

Combine soup and water. Add half of the noodles and the remaining ingredients. Toss and place in a baking dish. Sprinkle remaining noodles on top. Bake at 375 degrees F for 15 minutes.