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Heat 1 tbsp sunflower oil in a medium saucepan, then soften 1 chopped onion and 2-3 chopped carrots for a few mins.
When soft, turn up the heat, crumble in 500g lamb mince and brown, tipping off any excess fat.
Add 2 tbsp tomato purée and a large splash of Worcestershire sauce, then fry for a few mins.
Pour over 500ml beef stock, bring to a simmer, then cover and cook for 40 mins, uncovering halfway.
Meanwhile, heat the oven to 180C/fan 160C/gas 4, then make the mash. Boil the 900g potato, cut into chunks, in salted water for 10-15 mins until tender. Drain, then mash with 85g butter and 3 tbsp milk.
Put the mince into an ovenproof dish, top with the mash and ruffle with a fork. The pie can now be chilled and frozen for up to a month.
Bake for 20-25 mins until the top is starting to colour and the mince is bubbling through at the edges. (To bake from frozen, cook at 160C/fan 140C/gas 3 for 1 hr-1 hr 20 mins until piping hot in the centre. Flash under the grill to brown, if you like.)
Leave to stand for 5 mins before serving.
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