FILLING:

1 lb. ground beef
1 onion, chopped
1/2 c. mushrooms, chopped
1 tsp. salt
1/4 tsp. dry mustard
2 tbsp. parsley flakes
1 can or 1 1/4 c. beef gravy
1 (8 oz.) pkg. Mozzarella cheese, shredded

PASTRY:

1 3/4 c. flour
1 tsp. salt
2 1/2 tsp. baking powder
1/3 c. shortening
3 tbsp. parsley flakes
2/3 c. milk

Preheat oven to 400 degrees. Brown ground beef, add onions and mushrooms, stir frequently until meat and onions are brown. Stir in all dry ingredients, parsley and enough gravy to moisten. Stir all together over low heat for 5 minutes. Let cool while making pastry. Sift flour, salt, and baking powder into bowl. Add parsley. Cut in shortening until it looks like bread crumbs. Add enough milk to make fairly soft dough. Turn onto floured surface and knead lightly. Roll into 10 x 14 inch rectangle. Spread meat mixture over dough to within 1/2 inch of edges. Sprinkle on Mozzarella cheese. Dampen edges of pastry and roll up like jelly roll, pressing edges well together. Place on baking sheet and bake 30 minutes. Serve hot or cold.