Cut off top of medium sized pumpkin and cut a triangle notch on one side to make replacing lid easier to line up.
Scoop out the inside and wipe out with paper towel. Mark a face on the front with a permanent pen if you would like.
Spoon casserole mixture inside and bake 350 degrees for about one hour (on a cookie sheet) until meat of pumpkin is tender (if you will eat it, otherwise, just so dinner is hot inside).
Casserole Mixture:
Cook 1 1/2 to 2 lbs of ground beef with 1 chopped onion until fully cooked
Add 4 tablespoons soy sauce
Add 2 tablespoons brown sugar
Add 1 (4 oz) can sliced mushrooms, drained
Add 1 can cream of chicken soup
Add 1 (8 oz) can sliced water chestnuts, drained
Add 1 1/2 - 2 cups cooked rice
Simmer 10 minutes.