The turkey hero is the long-roll sandwich's least aggressive build, and that is the whole problem it has to solve. Sliced turkey breast is the mildest cold cut on the deli board: no cure, no spice, no fat, almost no salt by the standards of capicola or salami. Pile it on a New York hero roll with nothing but lettuce, tomato, and mayonnaise and the bread can easily out-talk the filling. The defining decision in a good turkey hero is therefore not the turkey at all. It is how much the roll and the dress are made to carry, because the meat will not carry the sandwich on its own.
The craft is in the roll and the build order. The hero is the New York name for the long roll, and the roll here is a length of Italian bread with a real crust: structure enough to hold a foot of soft filling without folding, an interior tender enough not to fight a delicate meat. Turkey is shingled the length of the roll rather than slabbed, so every bite gets the same thin, even layer instead of a wad in the middle. The lettuce is shredded so it distributes a cool crunch through the whole sandwich, the tomato is the moisture risk and goes in as part of the dressed structure rather than a wet afterthought, and the mayonnaise does double duty: it seals the crumb against the tomato and supplies the fat and salt the turkey lacks. Built carelessly this is bread and air; built with attention to the dress, the lean meat reads as the clean center of a balanced sandwich rather than its weakest part.
The variations push the turkey hero in two directions, toward the cold deli stack or the hot plate. A turkey club hero braces it with bacon and a third texture; an oil-and-vinegar build dresses it like an Italian hero and lets the seasoning, not the mayonnaise, do the lubricating; a hot turkey hero ladles gravy over sliced roast turkey and turns the roll into a vessel rather than a wrapper. Each of those is a codified build with its own rules, and each deserves its own article rather than being crowded in here.