Mom's Dinner in a Pumpkin

One of my favorite childhood memories is my mom making this dinner in a pumpkin every year around Halloween time. Making this tonight for FHE and smelling the casserole mixture brought back so many warm fuzzy memories. Good thing Jeremy loved this, because we will carry this tradition on.Recipe:
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.