Ingredients
* 2kg sirloin steak, in one piece from your butcher, if possible, or in as large pieces as possible.
* Fresh watercress, or other peppery salad leaves available.
For the marinade
* 1 lemon, squeezed
* 1 red chilli, finely chopped
* 2 garlic cloves, smashed and pounded into a paste(ish)
* 2 teaspoons ground cumin
* 1 teaspoon hot smoked paprika
* 100ml olive oil
* Sea salt and freshly ground black pepper
For the sauce
* 1 large bunch flat-leaf parsley, leaves picked
* 1 small bunch coriander, leaves picked
* 4 tablespoons sherry/red wine vinegar
* 2 tablespoons lemon juice
* 1-2 red chillies, finely chopped
* 2-3 garlic cloves, ground into a course paste
* 2 teaspoons ground cumin
* 2 teaspoon hot smoked paprika
* 200ml olive oil
* Sea salt and freshly ground black pepper