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Mix together 1 tsp miso, the vinegar, honey, soy and sesame oil with 1 tbsp water to make a dressing. Heat the grill to high. Line a grill pan with foil.
Put 2 tsp rapeseed oil in a frying pan. Tip in the leeks and cook over a medium heat for 5 mins until starting to soften. Stir in the garlic, grated ginger and remaining miso. Cook until the leeks are soft. Add the pak choi and rice with 1 tbsp water, breaking up the rice with the back of a spoon. Cook until the pak choi is wilted, then turn the heat down to low.
Drizzle the remaining oil over the mackerel and season. Put the fillets skin-side up on the grill pan and grill for 2-3 mins until just flaking.
Pour the dressing into the greens and rice. Mix well and divide between two bowls. Put the mackerel on top and scatter over the chilli and ginger.