First prepare the Green Chilli Sauce. Sauté the onion in the oil. Add the remaining sauce ingredients and cook for 5 minutes. Keep warm.
Sauté the mushrooms in the butter for approximately 5 minutes or until soft. Remove from the pan and keep warm. Shake the hickory salt on both sides of the steaks. Fry or grill until cooked as desired (10-15 minutes for rare; 15-20 minutes for medium),