INGREDIENTS
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450g (1lb) shortcrust or puff pastry (I made my own shortcrust pastry and doubled my usual recipe)
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2 large potatoes (peeled and cut into small, even-sized chunks)
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2 onions (peeled and cut into wedges)
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1 teaspoon English mustard powder
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280g (10ozs) Mature Farmhouse Cheddar cheese (grated)
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salt and pepper
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1 free-range egg (beaten with a little milk)