Put the couscous in a bowl, and then pour over just enough boiling water to cover it. Set aside for a few minutes to allow the couscous to absorb the water.
Heat a small non-stick frying pan and drizzle with a little oil. Add the courgette, French beans or asparagus tips with the chilli and cook for 2 minutes.
Add to the couscous with the chopped tomatoes, lemon or lime juice, coriander and lots of seasoning.
Break up the left over fish and toss in a little olive oil. Scatter the fish over the couscous and serve.