Wash and trim the Brussels sprouts, clicking off any tatty outer leaves.,
STEP 3
Cook for 8 minutes in a pan of boiling salted water, then drain well.,
STEP 4
Squeeze the chorizo out of its skin, crumbling it into a roasting tray with 1 tablespoon of olive oil.,
STEP 5
On the hob, fry over a medium heat for 6 minutes, until you have ruby oil, then crumble in the vac-packed chestnuts, strip in the rosemary leaves and shake about.,
STEP 6
Tip in the sprouts and toss in the sherry vinegar.,
STEP 7
Squash and flatten the sprouts with a potato masher so they suck up more flavour.,
STEP 8
Roast for 25 minutes, or until starting to colour. Season to perfection, bang out and serve.