Corned beef pie is made from corned beef, onion and often thinly sliced, cubed or mashed potato. It can be eaten hot or cold, making it a suitable common picnic food and also a "winter warmer". The corned beef from which the pie derives its name may be leftover corned beef, as from a Sunday dinner, or tinned Bully beef. The pie may be made with a mashed potato topping, as in Shepherd's pie, or with a traditional pastry crust.[1][2][3][4]
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