1. Cook the rice to pack instructions. Add the peas to the pan for the last 1 min of cooking, stirring briefy. Drain, tip back into the pan, then leave to rest for 2 mins with the lid on.
2. Fluff up the rice and peas with a fork. Stir in the chopped coriander and lime zest, and squeeze in the juice from half the lime wedges. Divide between 4 deep bowls and top with little piles of radish, cucumber, spring onion, the mackerel in katsu sauce and the reserved coriander leaves. Serve with the remaining lime wedges.
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