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Season the steaks on both sides and brush with a little oil.
To make the sauce, heat the remaining oil in a small pan, then add the onion and fry for 5 mins until soft and lightly browned. Add the remaining ingredients and simmer gently for 5 mins more.
Barbecue, griddle or grill the steaks for 3-4 mins on each side until cooked to your liking and serve with the sauce.