3-4 onglet steaks, approx 150 grams each
sea salt and ground pepper
¼ cup each mint, parsley and basil leaves
1 teaspoon dried tarragon
2 tablespoons capers
2 cloves garlic
zest 1 lemon
3 tablespoons olive oil
1 tablespoon grain mustard
1 tablespoon horseradish sauce
1 tablespoon lemon juice
Salsa: Put the herbs, anchovies, capers, garlic and lemon zest on a board and chop together to form a rough paste. Transfer to a bowl and stir in the oil, mustard, horseradish and lemon juice. Season with salt and pepper.
Steak: Brush the steaks with olive oil and season both sides generously with salt and pepper.
Preheat the barbecue until very hot. Cook the steaks for 3 minutes each side for medium rare. Transfer to a plate, cover loosely and rest for at least 5 minutes.
Slice the steaks across the grain and pour over any resting juices. Serve with the herb salsa.