coulis

Coulis comes from the Old French verb couler (to flow, to strain, to filter), which derives from Latin colare (to strain, to filter), from colum (a strainer, a sieve). The Latin root is the same that gave English 'colander' — the straining vessel through which liquid is poured. A coulis was originally the juice that ran from cooking meat, what we might now call drippings or jus: the liquid that flowed from the roasted or braised animal as it cooked. In medieval and Renaissance French cooking, this natural cooking liquid was the primary sauce — the thing that flowed from the food itself was considered the most direct and honest expression of its flavor, and the coulis was collected, enriched, and served with the meat. The term appears in the earliest substantial French culinary texts, including the Viandier of Taillevent (fourteenth century), where it names these meat-cooking liquids.

The meaning of coulis shifted substantially during the classical period of French cuisine, from the seventeenth through the nineteenth centuries. As French cooking became more systematized and sauce-making more elaborate, the coulis expanded from the natural meat juices to include concentrated, strained preparations — reductions of meat stock enriched with butter, vegetable purées passed through a fine sieve, fish preparations strained until smooth. By the classical period, coulis was a general category for any smooth, strained preparation that flowed freely — a category that included the concentrated meat coulis used as the base for sauces, the vegetable coulis used as accompaniments, and the fruit coulis that were already appearing in elaborate dessert presentations. The word named the flowing quality and the strained texture as much as any specific ingredient.

In contemporary English culinary use, coulis overwhelmingly refers to a smooth, strained sauce made from puréed fruit (raspberry coulis, strawberry coulis, mango coulis) or occasionally from puréed vegetables (red pepper coulis, tomato coulis). The dessert and savory applications both require the same technique: raw or lightly cooked fruit or vegetable puréed until completely smooth, then passed through a fine-mesh sieve to remove seeds and skin and achieve the characteristically glossy, lump-free texture the name implies. The coulis should pour — not too thick, not too thin — and should pool on the plate in a smooth ribbon that the diner can drag through with a spoon. The flowing quality encoded in the verb couler is the sauce's defining characteristic: a coulis that is too thick ceases to be a coulis.

The survival of coulis as a distinct culinary term, when English has the perfectly functional words 'purée' and 'sauce,' reflects the precision that the French term adds. A coulis is specifically smooth (passed through a sieve), specifically flowing (thinned to a pourable consistency), and specifically uncooked or minimally cooked (to preserve the fresh color and flavor of the fruit or vegetable). A tomato sauce and a tomato coulis are made from the same ingredient but prepared differently: the sauce may be cooked down and seasoned; the coulis is raw or barely cooked, strained to remove skins and seeds, bright and fresh. The French word earns its place in English by naming a category that English vocabulary does not otherwise distinguish — the smooth, strained, flowing sauce that is more than a purée and less than a cooked sauce.