In a large bowl, toss the sliced chicken with the oil and half the lemon juice. Heat a large nonstick frying pan and add the chicken, onion and garlic. Cook for 8-10 minutes, stirring, until the onion has softened and the chicken is cooked through. Slice into the chicken at the thickest point to ensure that it is completey cooked with no pink inside.
Cook the broccoli in a large pan of boiling water for 4 minutes, then drain and add it to the chicken along with the chilli. Stir and cook for a further 2 minutes.
Meanwhile, put the couscous into a bowl and pour over enough just boiled water to cover. Leave to stand for 2-3 minutes, until all the water has been absorbed. Fluff up with a fork and stir in the chicken along with the zest, parsley and remaining lemon juice. Season and serve.
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