6 ideas
France can be divided into three culinary domains according to the fat used as the cooking medium: butter in the dairy-rich north and west, animal fat (goose, duck, pork lard) in the southwest, the centre and Alsace, and olive oil in the Mediterranean south. The fat is the most reliable single marker of a regional cuisine because it colours every dish cooked in it and reflects what the local agriculture produces in surplus.
A region's cuisine is not an arbitrary cultural choice but a consequence of its soil, rainfall, temperature and terrain, which decide whether it can support cattle pasture, goose and pig raising, or olive groves. Cooks work with what the land yields cheaply and abundantly, so the physical environment sets the ingredients, and the ingredients set the dishes.
Mapping a country by its food produces boundaries that follow pasture lines, climate zones and crop ranges rather than administrative provinces or national frontiers. Regions that belong to one political unit can sit in different culinary domains, and areas where two fats meet form transitional zones with hybrid cooking. Reading a territory through what its people eat shows a different map from the official one.
A dish built from region-specific ingredients cannot be truly reproduced elsewhere, because substitutes change the result. Bouillabaisse depends on particular Mediterranean rockfish, so versions made with other fish are imitations rather than the dish itself. Authenticity lies in the local ingredient base, not in the recipe as a set of instructions.
What the world calls "French cuisine" rests on provincial home and peasant cooking, which developed from local produce long before any national style existed. Parisian and restaurant cooking gathered and refined dishes that originated in the regions. To understand a national cuisine, you have to trace it back to the regional kitchens that fed it.
Geography sets the base of a regional cuisine, but invasions, trade routes, border shifts and neighbouring cultures add further layers on top of it. Alsace's cooking, for example, carries Germanic influence on top of its animal-fat base. A region's dishes can be read as a record of both its landscape and the peoples who passed through it.