Mix the black and green peppercorns together and lightly press them on to the surface of both sides of the steaks.
Heat the oil and butter in a heavy-based frying pan and add the steaks. Cook them on both sides to your liking: 2–3 minutes each side for rare; 4–5 minutes each side for medium, and 7–8 minutes per side for well-done. Remove to a plate, cover with