Curried cod

Name: Curried cod
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: Indian, Asian
Ingredients: 1 tbsp oil; 1 onion, chopped; 2 tbsp medium curry powder; thumb-sized piece ginger, peeled and finely grated; 3 garlic cloves, crushed; 2 x 400g cans chopped tomatoes; 400g can chickpeas; 4 cod fillets (about 125-150g each); zest 1 lemon, then cut into wedges; handful coriander, roughly chopped