The nose arrives long before the flavor does, and the gap between them is what this sandwich has to be assembled around. Munster is a washed-rind cow's-milk cheese from Alsace, its rind brushed orange and sticky from repeated brine washing, the source of an aggressive, barnyard, almost pungent aroma that overstates how the paste actually eats. Under the rind the cheese is soft, creamy, and supple, with a flavor that is rich and lactic and far gentler than the nose promises, building to a savory finish rather than a sharp one. The build is a length of baguette, a thin spread of beurre demi-sel, and the Munster laid on in thick soft slices with the rind kept on, since the rind carries most of the aroma and a good part of the savor. What lifts it past a generic cheese sandwich is that distance between smell and bite: a cheese that arrives loud and finishes round.
The logic follows from the soft paste and the strong rind. A ripe Munster is closer to spreadable than sliceable, so it is laid in thick yielding pieces rather than thin shingles, and it slumps against the crumb as it warms, which means the work is containment rather than addition. The butter stays thin because the paste already supplies the richness. The rind is the decision point: kept on, it gives the full barnyard depth the cheese is known for; pared back, the sandwich turns milder and loses the character that makes it itself. The constraint is proportion, because even a gentle-tasting cheese this rich becomes heavy in quantity. The bread needs a firm crust because the filling brings no structure of its own, and the cheese should be near room temperature, where the paste turns creamy and the flavor reads savory and full rather than muted and soapy.
Variations follow a settled Alsatian habit. A scatter of cumin or caraway seeds against the paste is the regional pairing, an aromatic counter that meets the rind's funk rather than hiding it. A few thin slices of air-dried ham laid alongside give the soft cheese a cured, salt-firm partner. A younger, less-washed Munster pulls the sandwich down a register for anyone the rind defeats. Each is an adjustment around a soft, aromatic cheese, the bread and the restraint held constant. The Sandwich au Munster sits among the regional-cheese builds the catalog groups under Baguette Fromage, the long rack where each French cheese gets its own treatment. Its specific contribution is a washed-rind cheese whose aroma runs well ahead of a gentler, creamier taste.