Peel and finely grate the fresh ginger and set aside.
Zest the lemon then cut into wedges and set aside.
Heat the oil in a large, lidded frying pan. Cook the onion over a high heat for a few minutes.
Stir in the curry powder, ginger and garlic and cook for another 1-2 minutes.
Stir in the tomatoes and chickpeas, and season. Cook for around 6 minutes until starting to thicken slightly, then top with the cod. Cover and cook for another 10 minutes until the fish is cooked through.
Arrange on plates, scatter over the lemon zest and coriander, then serve with the lemon wedges.
Notes
If you can handle the heat, try this recipe with hot curry powder or add fresh chilli.