Preheat oven to 375°F. Wash squash well; cut off top and remove seeds. In a large skillet, cook the beef, celery, green pepper, and onion until meat is browned and vegetables are ten-der; drain. Add all remaining ingredients and cook an additional 3 minutes, mixing well. Spoon filling into prepared squash and place them on a cookie sheet. Bake for 1 hour.
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