Mix flour, salt and baking powder. Rub in shortening, and mix to dough with milk and water. Roll out to quarter of an inch thickness, bake in layer cake tins. Put together with the chopped meat mixed with the onion and seasoning, and heated hot with the gravy or stock. If stock is used, thicken with a tablespoon of flour mixed with one of butter, or butter substitute. Serve as soon as put together. Cold cooked fish heated in cream sauce may be used for a filling instead of the meat.