Preheat the oven to 180°C/350°F/gas 4. Wash and trim 1kg of Brussels sprouts, clicking off any tatty outer leaves. Cook for 8 minutes in a pan of boiling salted water, then drain well. Squeeze 150g of raw higher-welfare chorizo out of its skin, crumbling it into a roasting tray with 1 tablespoon of olive oil. On the hob, fry over a medium heat for 6 minutes, until you have ruby oil, then crumble in 100g of vac-packed chestnuts, strip in the leaves from 2 sprigs of fresh rosemary and shake about. Tip in the sprouts and toss in 1 tablespoon of sherry vinegar. Squash and flatten the sprouts with a potato masher so they suck up more flavour. Roast for 25 minutes, or until starting to colour. Season to perfection, bang out and serve.

182 kcals, 10.1g fat (3g saturated), 9.4g protein, 14.2g carbs, 5.7g sugar, 1g salt, 1.2g fibre.