Dinner in a Pumpkin

This is my moms recipe that I grew up having every Halloween.  I think its delicious with the pumpkin meat.  Jared will eat this as long as he doesn't get any pumpkin on his plate.
1 small to medium pumpkin
1 onion, diced
2 lbs Ground Beef
2 T. Soy sauce
2 T. Brown Sugar
1 can sliced mushrooms, drained
1 can cream of chicken soup
1 1/2 c. cooked rice
1 8 oz. can sliced water chestnuts, drained

Cut off the top of pumpkin and thoroughly clean out seeds an pulp.  Paint a face on the front of the pumpkin with a permanent marker.  pre-heat oven to 350.  In a large skillet, brown beef and onions.  Drain and add soy sauce, brown sugar, mushrooms and soup.  Simmer 10 min.    Add cooked rice and water chestnuts. Spoon mixture into the cleaned pumpkin shell.  Replace pumpkin top and place entire pumpkin on a baking sheet and bake 1 hour or until the pumpkin meat is tender.