50g parmesan, grated, plus extra to serve (optional)
2 garlic cloves
150ml rapeseed oil
500g dried pasta
1 tbsp olive oil
250g pack chestnut mushrooms, quartered
Put the chestnuts in a food processor and pulse until roughly chopped. Throw in the herbs, Parmesan and garlic, then pulse again until chopped (not too finely). Pour in the rapeseed oil, mix together and season to taste.
Cook the pasta in plenty of boiling salted water, according to pack instructions. Meanwhile, heat the olive oil in a large frying pan and fry the mushrooms with some seasoning for 6-8 mins until tender and starting to brown. When the pasta is cooked, drain it, return to the pan, then stir through the pesto and the mushrooms. Serve with some extra Parmesan on top, if you like.