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Mix together the sesame oil and lime juice with some seasoning, then toss with the red cabbage, chilli, yellow pepper, beansprouts and peanuts.
Heat a non-stick frying pan until searing hot. Season the tuna steaks on both sides and turn them in the sesame seeds to coat. Fry for 3 mins each side until the tuna is browned and a sesame crust has formed, but the fish is still pink in the middle. Leave to rest for a few mins, then serve with the slaw and lime wedges for squeezing over.