1.Preheat oven to 220°C (200°C fan-forced). Line a baking tray with baking paper. Place fish on prepared tray; cook as packet directs.
2.Meanwhile, place couscous and crumbled stock cube into a medium heatproof bowl; stir in 1 1/2 cups boiling water. Cover with plastic food wrap; set aside for 5 minutes until liquid is absorbed. Using a fork, fluff and separate grains. Cool for 5 minutes.
3.Add rocket, zest, juice, tomato, onion, olives and chickpeas to couscous. Stir until combined. Serve couscous with fish and lemon wedges.
Use regular tomatoes instead of cherry tomatoes. You can use baby spinach leaves instead of rocket.