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Rinse the quinoa and simmer, part covered, in 600ml boiling water for 15 minutes until tender; drain and cool.
Mix the dressing ingredients.
Chop the watercress, kale and spinach. Mix with the quinoa, all the other ingredients and the dressing; season.
Sumac is a red, lemony-tasting Middle Eastern spice – you will find it alongside the other spices in the supermarket.
Greens are a great way to add fresh colour and crunch to your dishes, and they're vitamin-packed. Try this salad with grilled mackerel or chicken