Panino con soprassata toscana is not what its near-twin name suggests, and the distinction is the entire article. Spelled soprassata rather than soppressata, the Tuscan version is not a dry-cured salame at all but a cooked head cheese: pork from the head and other gelatinous cuts simmered until tender, picked, seasoned with pepper, citrus zest, and often pistachio, then pressed into a casing and set with its own natural gelatine. The result is a brawn, a sliceable jellied terrine that wobbles slightly and falls apart softly on the tongue, moist and aromatic, with none of the firm chew or fermented tang of a hung salame. Anyone reaching for it expecting the pressed Calabrian or Lucanian sausage has the wrong food entirely; this is closer to a country pâté in a casing than to cured meat, and the sandwich is built around that softness.
The craft is in cutting a fragile gelatinous thing and giving it a stable bread. Soprassata toscana is sliced thick, because thin slices collapse and the set is too soft to hold a fine edge; a thick slice keeps the inlay of meat, fat, and pistachio visible and intact. It is kept cool until assembly so the gelatine stays firm, since warmth slackens it toward spreadable. The bread is the Tuscan answer to richness: unsalted or barely salted pane toscano, a sturdy bloomed loaf whose blandness is deliberate, so it carries a heavily seasoned, fatty, citrus-scented terrine without competing with it. No condiment is needed, because the soprassata already contains its own acid and spice; a piece of the plain bread against the soft set is the only contrast the sandwich wants.
The variations stay in Tuscany and stay close to the cooked-pork tradition. The terrine appears alongside pickles that cut its richness, or as part of a board of Tuscan salumi where its softness offsets the firmer cuts. The pressed dry soppressata of the South, Calabrian, Lucanian, Molisan, and the base southern style, are fermented salami and a wholly different category despite the shared name. Each deserves its own article rather than being crowded in here.