Start by making the salsa verde. Finely chop the herbs, capers and watercress, then mix with all of the other ingredients
2
Light a barbecue for direct cooking. When the flames have died down and the coals are covered in a layer of grey-white ash, the barbecue is ready for cooking
3
Brush the steak with oil on both sides and season heavily with salt and pepper
4
Place on the grill, turning very frequently - every 30 or seconds or so - until the steak has cooked for around 3 minutes on each side
5
Transfer to a plate, cover loosely with foil then allow to rest for 5 minutes before slicing and serving with the salsa verde. This is excellent when served with boiled new potatoes