Stir the extra virgin olive oil and lemon zest and juice together in a large bowl and season with a little salt and pepper. Stir in the onion and set to one side.
Place the couscous in a separate bowl then pour over the stock. Cover with a plate and leave to steam for 5 minutes then fluff with a fork.
Add the couscous and the rest of the ingredients to the oil and onion mix and stir everything together.
Serve with a little chopped parsley on top.
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