Tigelle con prosciutto is the version where a single cured meat is the headline and the bread is its warm frame. The tigella, properly the crescentina, is a small leavened disc cooked between the patterned plates of a tigelliera until pale and faintly freckled, then torn open along its equator while still hot. Inside goes prosciutto crudo, the sweet Emilian raw ham of Parma or its neighbours, sliced thin and laid in soft folds. The defining mechanism is the warmth of the disc against the cool ham: the heat does not cook the prosciutto but it relaxes its fat just enough to release the sweetness and the savour, and the soft bread cushions the salt rather than fighting it. The ham needs the warm crumb to bloom and to soften its edge; the disc needs the ham's sweet fat and salt to be more than plain bread. Each completes the other in the brief window the tigella stays hot.
The craft is in the slice, the seam, and a thin film of fat to bind them. Prosciutto must be cut very thin, almost to translucency, so it drapes into the disc and yields immediately rather than pulling out in a tough sheet, and it is laid loosely so the warmth moves through it. The disc is filled the moment it comes off the iron, since a cooled tigella leaves the ham flat and the build inert. Because lean prosciutto can sit slightly dry against bread, the canonical move is a thin smear of cunza or a little soft cheese in the seam first, enough to slick the crumb and marry the ham to it without burying the meat. A good build keeps the ham generous but single, letting it be the whole flavour. A sloppy version uses thick rubbery slices, a cold disc, or crowds in extra meats and loses the clean single-ham line entirely.
The variations are the same warm split disc met by a different filling, each its own article. There is the disc dressed only with pounded cunza or the fuller pesto modenese, the one with whole thin lardo, the prosciutto paired with soft squacquerone or stracchino rather than left plain, and the loaded salumi misti build that trades the single ham for many. The same prosciutto also goes into warm gnocco fritto, a fried carrier instead of a pressed one. Each swaps a single element while the iron and the seam stay constant, and each deserves its own article rather than being crowded in here.