4 Make chimichurri
Meanwhile, chop the parsley, coriander (stalks included) and spring onion very very finely (a food processor works best!) . Peel and mince the garlic. Add the garlic, parsley, coriander, spring onion, red vinegar, olive oil, a pinch of chilli flakes (spicy!) and salt to a bowl. Mix until combined - this is your chimichurri.