Place chickpeas, couscous, vegetable stock powder, coriander and garlic in a large bowl. Pour over hot water, shake to level out couscous (chickpeas should mostly settle on top). Cover with plate or cling wrap, set aside for 5 minutes.
Fluff couscous with fork. Cool a bit.
Add coriander, parsley, onion, sun dried tomatoes (including all oil), rocket, lemon juice and black pepper. Sprinkle zest across surface. Toss well to combine.
Adjust salt and pepper to taste.
Transfer to serving bowl, sprinkle with feta. Serve.