Heat a large frying pan and fry the lamb mince for 5min until cooked through and browned. Lift out of pan using a slotted spoon and set aside to cool. Next, add the potato, carrot, leek and garlic to the pan and cook until just softened, about 10min.
Step 2
Return the lamb to the pan and add the Worcestershire sauce, tomato purée, mint and a splash of water. Cook for a few minutes; check seasoning. Set aside to cool completely.
Step 3
Preheat oven to 200°C (180°C fan) mark 6. Cut pastry into quarters, and roll each piece out on a lightly floured work surface to a rough 18cm (7in) square. Divide the lamb mixture equally among the squares, leaving a 1cm (½in) border of pastry. Brush pastry with beaten egg, then crimp edges to seal. Transfer to a baking sheet and brush again with egg. Cook for 30min until deep golden. Serve warm or at room temperature with a salad.
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