Most sandwiches are an argument for more; this one is an argument for less. Foie gras, the enriched duck or goose liver, is so fat-heavy that a slice of it on bread is closer to a rich spread than a layer of meat, and the whole craft is keeping that richness in check. In the Périgord and the wider Southwest, where the birds are raised, the sandwich is treated as a special-occasion build rather than a daily one, and it is judged on balance more than on generosity.
The supports are predictable because the payload demands them. Bread with character, brioche or a crusted loaf, holds the slice without competing. Fleur de sel lifts the liver; a sweet note, fig or onion confit, presses back against the fat; the sandwich is served cold or barely warmed so the fat does not render out. Slice it too thick and it coats the palate; the discipline is portion, not abundance.
The Sandwich au Foie Gras sits with the spread and terrine builds the catalog groups under Baguette Pâté. Its specific contribution is the richest fat on that shelf, which makes restraint, not quantity, the thing that decides whether the sandwich works.