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Put the couscous in a heatproof bowl and pour over boiling water to just cover. Cover with cling film and leave to stand for 5 mins.
Mix the lemon zest and juice, oil, tahini and garlic, and season to taste. Fluff the prepared couscous and season. Spoon onto a large serving platter and scatter over the courgettes, tomatoes, feta, herbs and chilli. Drizzle over the dressing.