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Potage, Soubise-Bretonne
Have a pint white beans soaked in fresh water for twelve hours and ready for use. Finely chop five medium-sized sound white onions, place in a saucepan with half ounce melted butter and cook for ten minutes without browning, occasionally stirring with a wooden spoon. Moisten with a pint milk and two quarts of broth or hot water. Season with two teaspoons salt and half teaspoon white pepper. Thoroughly drain the beans and add to the broth with one sliced carrot, two sliced leeks, one sliced branch celery, two branches parsley, two cloves, one bay leaf and one ounce lean salt pork cut into small squares. Cover the pan, then let slowly simmer for one hour and a half, being very careful to mix with a wooden spoon every ten minutes. Uncover the pan, skim the fat from the surface, then press the whole through a fine wire sieve, then through a Chinese strainer into another saucepan; let slowly boil for five minutes; add one gill cream and half ounce butter divided in small bits, mix well with a wooden spoon for half minute, pour into a hot soup tureen and send to the table with bread croutons, separately.
A purée soup in the classic French manner, combining two named garnishes: soubise (onion) and bretonne (white beans). It is straightforward, but the sieving and the milk both want attention.
- The hinge: keep the milk from scorchingA pint of milk in a pot of beans over an hour and a half will catch on the bottom unless the heat is genuinely low and the wooden spoon goes round every ten minutes as instructed. That stirring direction is not fussiness; it is the whole reason the soup does not taste burnt.
- A pint of beansDry beans were measured by volume; a pint is roughly 12 to 14 oz, about 2 cups. Any small white bean works — navy, cannellini or the French coco type. The 12-hour soak is still the right call.
- Simmering time is optimisticAn hour and a half will soften most soaked beans, but older stock, hard water, or the acidity of a long-held bean can leave them chalky. Test before you sieve: they must crush easily against the pan, or the purée will be gritty.
- A gillHalf a cup, 4 fl oz. It goes in after the five-minute boil, with the butter, and is only mixed for half a minute, so it is not really cooked further; the recipe does not actually say to take the pan off the heat.
- Chinese strainerA chinois — the tall conical fine-mesh strainer. The recipe asks for two passes, first through the fine wire sieve to break down the beans and vegetables, then the chinois for smoothness. A blender or food mill does the first pass in seconds; the chinois pass is still worth doing for texture.
- Pull the aromatics firstBay leaf, cloves and parsley stems should come out before pureeing. Whole cloves in particular will not sieve out cleanly and a fragment in the bowl is unpleasant.
- SaltTwo teaspoons is calibrated to plain water or an unsalted homemade broth, plus salt pork. With commercial stock, hold most of it back and season at the end.
- YieldThe recipe starts from a pint of milk and two quarts of broth, plus a pint of beans and the vegetables, so expect something over two quarts of finished soup — six to eight servings. The croutons go to the table separately so they stay crisp.
French classical cookery names purée soups after their defining vegetable, and this one carries two labels at once: soubise for onion, and bretonne for white beans, the dried haricots long associated with Brittany and with the beans of the Vendée and Soissons. The onion designation is generally traced to the 18th-century Prince de Soubise, whose kitchen is credited by tradition — as with béchamel and Mornay — with the onion purée that bears the name, though the attribution is culinary folklore rather than documented fact. The method itself is standard: sweat the onions in butter without color, cook everything together, then force it through a sieve and finish with cream and butter. That sequence, and the insistence on a wooden spoon and a chinois, reads as professional-kitchen French vocabulary carried over into English, though nothing in the text itself establishes where it came from.