Dinner in a Pumpkin

This is a Halloween meal and it is sooooo good. I love it. It has always been a tradition at my house to have this for halloween!

1 small to medium pumpkin
1 onion, chopped
2 TBSP vegetable oil
2 lbs ground beef
2 TBSP soy sauce
2 TBSP brown sugar
1 can (4 oz) sliced mushrooms, drained
1 can cream of chicken soup
1 1/2 c. cooked rice
1 can sliced water chestnuts, drained -optional

Cut off top of pumpkin, and thoroughly clean out the seeds and pulp. Preheat oven to 350*. In large skillet saute onions in oil until tender. Add meat and brown. Drain drippings. Add soy sauce, brown sugar ,mushrooms, and soup. Simmer 10 minutes stirring occasionally. Add cooked rice and water chestnuts. Spoon mixture into the pumpkin. Replace lid and put on baking sheet. Bake 1 hr or until inside meat of pumpkin is tender.