Fried fish & tomato curry

Name: Fried fish & tomato curry
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: Indian
Ingredients: 2 tbsp vegetable oil , plus 2 tsp; 2 onions , thinly sliced; 8 large vine tomatoes , roughly chopped; 4 garlic cloves; thumb-sized piece ginger , roughly chopped; 3 tbsp Madras curry paste; 165ml can coconut milk; large handful coriander , finely chopped, plus extra sprigs to serve; 500g pollock fillets, skinned; 6 tbsp plain flour; basmati rice , to serve