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Heat the oven to 200C/fan 180C/gas 6. Put the cauliflower in an ovenproof dish or tin, add the turmeric, some seasoning and 2 tbsp oil, and toss together.
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Roast for 20-25 minutes until tender. Tip onto a plate and cool.
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Meanwhile boil the rice in salted water until tender, adding the edamame and peas for the last minute of cooking, then drain well. Leave to cool, then tip into a large bowl.
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Add the roasted cauliflower, lemon juice, cucumber and some seasoning, and toss together.
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Add the herbs and toss again.
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Whisk together the dressing ingredients.
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Divide the cauli rice between plates, scatter over the cashews and drizzle with the dressing.