Step 1: To start, take the frozen pastry out to defrost a few hours prior to making the pie or alternatively you can defrost it in the microwave.
Step 2: Peel the potatoes, half them and add to a pan of salted water. Bring to a rolling boil. Boil the potatoes until they become soft enough to slide a sharp knife through.
Step 3: Whilst boiling the potatoes, in a seperate pan, empty the can(s) of stewing steak and heat gently until the gravy becomes more fluid (you can add a touch of water to loosen the gravy).
Step 4: Preheat an oven to 200 degrees.
Step 5: When the potatoes are done, drain and empty them into an oven proof dish. Top with the stewing steak and gravy and then top with the pastry.
Step 6: Brush the pastry with an egg yolk and place in the oven until the pastry is golden.
Step 8: Serve with veg and gravy if you wish.