Why did Sophie make this dish?
How to make Shepherds Pie
Heat the oil in a medium saucepan, then soften the onion and carrots for a few mins. When soft, turn up the heat, crumble in the lamb and brown, tipping off any excess fat. Add tomato puree and Worcestershire sauce, then fry for a few mins. Pour over stock, bring to a simmer, then cover and cook for 40 mins, uncovering halfway.
Heat the oven to 180C/ fan 160C/ gas 4, then make the mash. Boil the potatoes in salted water for 10-15 mins until tender. Drain, then mash with the butter and 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 color.