Sesame-Crusted Tuna Steak

Pat the tuna steaks dry and season lightly with salt and pepper.

Mix soy sauce, lime juice, sesame oil, ginger and garlic in a shallow dish. Coat tuna lightly, then leave for 10 minutes.

Combine black and white sesame seeds on a plate. Press each tuna steak into the seeds so all sides are evenly coated.

Heat neutral oil in a heavy hob pan over high heat until just smoking.

Sear tuna for 45 to 60 seconds per side for rare (or 90 seconds for medium-rare), keeping the centre pink.

Rest for 1 minute, then slice and serve with spring onions and any extra lime.