The Fougasse aux Olives Garnie is a Provençal bread that arrives already halfway to being a sandwich. Fougasse is a flat, leaf-shaped or slashed bread enriched with olive oil, and the olive version has chopped black or green olives worked through the dough before baking, so the loaf is studded and seasoned throughout rather than relying on a filling for flavor. Split and garnished, it becomes a sandwich whose bread is doing most of the savory work before anything is added.
That built-in seasoning is the whole logic of the sandwich and also its constraint. Because the bread already carries olive oil and a steady hit of olive salt, the fillings have to stay restrained or they fight the loaf. The successful versions keep it simple and Provençal: a few slices of jambon cru, a soft cheese, some roasted pepper or tomato confit, a leaf of basil, occasionally nothing more than good oil and a tomato rubbed across the cut face. A heavy, sauced filling would bury the fougasse's own character, which defeats the reason to use it instead of a plain baguette. The bread is dense and slightly chewy, holds up to oil without going soggy, and tears rather than snaps.
The Fougasse aux Olives Garnie belongs with the southern bread snacks that the catalog groups under Pissaladière & Niçois Bread Snacks, the cluster of Mediterranean flatbreads and oil-rich loaves that the French sandwich tradition handles differently from the baguette. Its specific contribution is the most thoroughly pre-seasoned bread in the French repertoire: a loaf where the olives are baked in rather than laid on, so the sandwich starts from a position of flavor and asks the filling only to keep up.