The garniture bordelaise draws its identity from Bordeaux, marrying the region’s legendary wines with its prized cèpes (porcini mushrooms) and shallots in a garnish of remarkable depth and earthiness. The garnish has two principal forms: for meat, it centres on cèpes sautéed in oil with shallots and parsley, accompanied by sauce bordelaise built on red wine reduction with bone marrow; for fish (à la bordelaise in the Bordelais tradition, confusingly distinct from the Parisian codification), it features a white wine sauce. The meat garnish begins with fresh cèpes, cleaned meticulously — never washed but wiped with a damp cloth and scraped — then sliced 5mm thick and sautéed over very high heat in a mixture of olive oil and a little butter. The mushrooms must not be crowded; they need direct contact with the hot pan surface to achieve proper caramelisation. Once golden, finely minced shallot and chopped parsley (the persillade) are added in the final 30 seconds. The accompanying sauce bordelaise is a masterwork: shallots sweated in butter, red Bordeaux wine (a young Saint-Émilion or similar) reduced by three-quarters with thyme, bay, and mignonette pepper, then mounted with demi-glace and finished with diced poached bone marrow. The marrow must be soaked in cold salted water for 2-3 hours to purge blood, then poached in barely simmering salted water for 12-15 minutes until translucent. It is sliced into rounds and placed atop the meat at service, never cooked into the sauce which would cause it to dissolve. This garnish epitomises the Bordelais philosophy that wine belongs in the sauce, not just the glass.
Cèpes wiped clean, never washed. High heat essential for mushroom caramelisation. Persillade added in final 30 seconds. Sauce bordelaise requires three-quarter wine reduction. Bone marrow soaked, poached separately, placed at service.
Use a young, fruity red Bordeaux — not a grand cru, which can become bitter when reduced. Test marrow doneness by pressing gently; it should yield slightly but hold its shape. Adding a teaspoon of meat glace at the end intensifies the sauce dramatically. The persillade should use flat-leaf parsley only.
Washing cèpes, making them waterlogged. Crowding mushrooms in the pan. Reducing wine insufficiently, leaving harsh tannins. Cooking marrow into the sauce where it dissolves. Using old, oxidised wine for the sauce.
Le Guide Culinaire (Escoffier)