Brown beef in skillet, stirring frequently. Add celery, onion, green pepper, salt, pepper, tomato and Worcestershire sauces. Cover and simmer 15 minutes.
Roll out pastry to 8 ½" square by placing 8" pan on pastry and cutting around it with knife, leaving ½" margins.
Place hot meat mixture in 8" square pan and top with square of pastry, turning under edg