The Fish Cutlet Sandwich is the coastal-Indian move of taking a breaded fish patty and putting it in bread. Along the seaboard, where fish is the default protein and a fried cutlet is a standard tea-time item, slipping that cutlet between two slices is the obvious next step: a handheld meal assembled from a component the kitchen already makes. It belongs to the broad family of Indian fried-snack sandwiches, and its identity rests entirely on the cutlet, not on the bread, which is usually plain soft white loaf bread doing the work of a carrier.
The build is short and the patty is the whole question. Cooked fish is flaked and mixed with aromatics, often a coastal spice base, then bound just enough to press into a flat oval. It is crumbed and shallow- or deep-fried until the outside is firm and golden. To assemble, the cutlet goes onto bread, sometimes with a thin layer of chutney or a smear of butter on the slice, raw onion for crunch, and very little else; the cutlet is meant to dominate. Good execution is a cutlet that is flat enough to bite cleanly through with the bread, crisp at the edges, moist in the center, and seasoned so the fish reads first. Sloppy execution is a thick, domed patty that squeezes out of the bread when bitten, a soggy crust from a patty that sat too long, or a bread-heavy sandwich where the cutlet is an afterthought slice rather than the point.
Because the patty is the variable, the sandwich shifts with regional spicing: a milder, herb-forward cutlet in one stretch of coast, a chili-and-coconut-leaning one in another. Some versions add a slick of chutney or a few onion rings for sharpness against the fried fish; others keep it austere. The flatter Bengali fish fry and the rounder fish chop are close relatives built on the same fried-fish logic, and each deserves its own article rather than being crowded in here. What defines this one specifically is restraint: a cutlet, bread, and just enough around it to keep the fish in the foreground.