Combine avocado, onion, tarragon, cayenne and vinegar in a medium bowl. Season with salt and pepper. Gently stir salsa to combine
Preheat a chargrill pan or plate over high heat. Lightly brush both sides of each steak with oil. Cook steaks on 1 side until the first sign of moisture appears on the surface. Turn and cook for 1-2 minutes or until cooked to your liking (see tip). Transfer to a plate. Loosely cover with foil and set aside to rest for 5 minutes to allow the meat fibres to relax and reabsorb their juices
