The Sandwich Boudin-Pommes is the same Norman pairing of blood sausage and apple recorded under its shorter, everyday name, and what defines this reading is the caramelised apple. Where the Sandwich Boudin Noir aux Pommes keeps the orchard fruit tart and bright, this version cooks the apple down in butter until the sugars darken and the slices go glossy and soft. The build is a sturdy crusted loaf split lengthwise, the boudin noir warmed and pressed in from its casing, the caramelised apple spooned alongside. The two are the same regional dish carried twice by the catalog because both names are used; this one is the deeper, sweeter, more confected side of it.
The logic follows from the caramelisation. Browning the apple in butter does two things to the sandwich: it concentrates the sugar, so the fruit reads richer and rounder against the iron of the boudin, and it adds a faint toasted, almost nutty depth that a raw or barely-cooked apple does not have. That changes the balance from the tart version. Here the apple is not lifting the blood sausage with acidity so much as wrapping it in sweetness and warmth, which makes for a softer, more comforting sandwich and a more forgiving one, since caramel sits more easily next to fat than sharp acid does. Served warm the sausage is silky and the apple almost jammy against it; served cold both seize and the contrast is lost. The bread needs a firm crust because the entire filling is soft and the crust is the only structure holding the bite together.
Variations move along the sweet side rather than off it. A deeper, darker caramel pushes the toasted note further against the iron; a spoonful of onion confit trades fruit sugar for savoury sweetness; a thread of cider reduction adds orchard depth without crunch. For those who want the blood to stay forward, a smear of sharp mustard supplies acid the caramel deliberately leaves out. Each holds the warm boudin noir as the constant and changes only how the sweet foil is built. The Sandwich Boudin-Pommes belongs with the cured and cooked-sausage sandwiches the catalog groups under Sandwich Saucisson & Charcuterie. Its specific contribution is the caramelised apple: sweetness and toasted depth wrapped around the iron rather than acidity cutting through it.