Cheesy sausage and mash pie

Method

1. Heat the oven to 200°C/180°C fan/gas 6. Fry the pork sausagemeat in a shallow, hob-safe medium casserole over a medium heat for 8-10 minutes until golden, breaking up the sausagemeat with a wooden spoon. Scoop out using a slotted spoon and set aside.
2. Add the onion to the casserole, then turn down the heat and cook for 15 minutes until lightly caramelised. Add the crushed garlic, fresh thyme leaves, onion chutney and Marmite, stir for a few minutes, then pour in the red wine. Bubble until reduced by about half. Meanwhile, put the potatoes in a large pan of water, bring to the boil, then simmer for 12-15 minutes until tender. Drain well, then mash until smooth. Stir in a large knob of butter, the whole milk, 50g of the grated cheddar and some ground black pepper.
3. Mix the cold beef stock with the cornflour and add to the casserole with the hot beef stock. Stir well, bring to a simmer and cook until thickened, stirring to prevent lumps. Stir in the sausagemeat, then season to taste. Spoon the mash over the filling, sprinkle with the rest of the cheddar and bake for 30 minutes until golden and bubbling.