We've taken inspiration from the many versions of the fish-fry that are so popular in southern India, particularly Kerala. Yellowtail scads are little beauties, with lovely oily flesh that goes perfectly with the spices rubbed into the flesh here. If they're unavailable use sardines or mackerel; you may need to adjust the cooking times. Add a crisp lettuce salad to make this a summer favourite.
Note Kashmiri chilli powder is available from Herbie's Spices; fish masala powder is available from Indian and select Asian grocers.