The Sandwich Carottes Râpées is the everyday vegetarian sandwich of the French lunch counter, and its whole character comes from one prepared salad rather than from anything assembled fresh. Carottes râpées is carrot grated fine and dressed in a sharp vinaigrette, usually lemon or vinegar with oil, sometimes a little parsley, sometimes a handful of raisins folded through. The sandwich is that salad given a loaf: a split baguette, often a thin layer of butter on the crumb, the dressed carrot mounded inside, and little or nothing else. It is one of the few French sandwiches that is fully meatless by design rather than by subtraction.
The logic is the dressing carrying the whole thing. Grated carrot on its own is sweet and bland; the vinaigrette is what makes it a filling, the acid lifting the sweetness and the oil giving it body. The constraint is moisture, because a dressed salad keeps weeping vinaigrette into whatever holds it. The carrot has to be drained before it goes in rather than packed dripping, and the butter on the crumb is doing real work here: it is a thin fat barrier between the wet salad and the bread as much as it is seasoning. The bread needs a firm crust and a crumb with some chew to hold up under an acidic filling that offers no structure of its own. There is no heat and no reason to wait. This is a sandwich made close to service and eaten plainly, the salad already dressed and resting, the assembly done last.
Variations stay within the deli vocabulary. A version with raisins worked into the carrot pushes the sweet side and adds a chewy contrast; one paired with a few rounds of hard-boiled egg or a leaf of butter lettuce builds it toward a fuller crudités register; the plainest is dressed carrot and buttered bread alone, the salad standing as the entire filling. Each keeps the vinaigrette-dressed grated carrot as the fixed point and changes only what sits beside it. The Sandwich Carottes Râpées belongs with the plant-forward builds the catalog groups under Sandwich Végétarien. Its specific contribution is the prepared salad as the whole sandwich: a build whose quality is decided by the dressing and by how well the carrot was drained before the lid went on.