The Sandwich Jambon de Vendée is a ham sandwich whose ham is the entire argument, and the ham is not the one most people picture. Jambon de Vendée is a Vendéen specialty: pork rubbed and steeped with the region's eau-de-vie and a herb seasoning, then matured, so it is not an air-dried ham like Bayonne and not a poached pale ham like jambon de Paris. It eats deep red, lightly firm, and aromatic, with a brandy-and-herb edge running under the salt. The build is a length of crusted bread, often a thin layer of barely-salted butter, and slices of the marinated ham laid in folds. The defining element is that herb-and-spirit cure, distinctive enough that the sandwich exists to show it rather than dress it.
The logic follows from the kind of ham it is. Because it is steeped rather than air-dried, the Vendée ham keeps more moisture and reads softer and more aromatic than a draped dry-cured slice, which means it leans on bread and butter the way a tender ham does, not on the bare-crust restraint a hard saucisson asks for. The butter is the bridge here: it carries the herb and brandy notes across to the wheat instead of letting them sit flat. The constraint is the seasoning itself, already assertive, so a loud condiment competes with the cure instead of supporting it. The bread needs a real crust because the ham is flexible and brings no structure of its own; the slices want to be thin enough to fold so the marinated character spreads through the bite rather than landing in one dense block. A leaf of frisée or a cornichon supplies a single acidic note. Built close to bare and eaten while the crust still has bite, it is a clean regional ham sandwich.
Variations stay near the Vendée table rather than leaving it. A thicker or thinner cut shifts how strongly the cure reads; the mogettes, the region's white beans, turn up alongside in fuller versions; a local butter or a touch of mustard moves the bridge. Each is a recognizable adjustment of the same marinated-ham idea. It belongs with the ham builds the catalog anchors to Jambon-Beurre, and its particular contribution is a herb-and-spirit cured ham, distinct from the dry-cured and poached hams, that the sandwich is built to present rather than mask.