In a large pan, cover rice with 600ml (1 pint) cold water. Bring to boil, cover and simmer for 20min. Add quinoa, cover and simmer for 15min (stir occasionally). The rice will dye the quinoa black. Add frozen soya beans, return to the boil and simmer for 2min until rice is al dente and quinoa is cooked. Drain through a sieve and run under cold water to cool. Tip into a serving bowl.
Step 2
Meanwhile, in a small bowl, whisk together lemon zest and juice, ginger, honey and soy sauce to make a dressing.
Step 3
Toss dressing, carrots and red cabbage through rice mixture. Check seasoning. Scatter over avocado and flaked mackerel. Serve.
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