Filé powder

• filé

  Louisiana French

• kombo

  Choctaw

Mildly aromatic and slightly astringent, with a woodsy, faintly eucalyptus quality. The flavour is the second reason to use filé; the first is what it does to the texture of a liquid, which is to give it a specific soft viscosity nothing else quite reproduces.

Green and faintly medicinal, with a root-beer or sassafras note underneath that is much gentler in the leaf than in the root bark. It smells more like dried leaf than like the tree.

A fine sage-green powder. Brown or khaki filé is old, and colour tracks both aroma and thickening power reasonably well.

The point of the ingredient. Filé contains mucilage that swells in hot liquid and thickens it to a soft, slightly ropy consistency — recognisably different from a roux-thickened or an okra-thickened gumbo, and the reason the three are regarded as three styles rather than three routes to one result.

• Mucilage polysaccharides — The thickening, and the reason the ingredient exists. They hydrate and swell in hot liquid and are destroyed by boiling, which is the whole basis of the off-the-heat rule.
• Safrole — The sassafras aroma. Present in the leaf at far lower levels than in the root bark, which is the distinction that governs its regulatory position.(what safrole is)
• Various monoterpenes — The green and faintly medicinal notes over the top.

Take the pot off the heat first. That is the entire technique and it is not negotiable: the mucilage that thickens a gumbo is destroyed by boiling and the result is a stringy, ropy liquid that cannot be rescued. Stir in a teaspoon or so at a time once the pot is off the flame, or — which is the more traditional practice and much safer — put the jar on the table and let each person thicken their own bowl. Filé is also a flavour, so a gumbo already thickened with roux can take a pinch of it for the sassafras note alone.

A thickener and flavouring for gumbo, and essentially nothing else. It is one of three traditional Louisiana thickeners alongside okra and a dark roux, and the style of gumbo is named for which one is used. It is added off the heat or at the table rather than cooked into the pot.

• infusing — Stirred into a hot gumbo off the heat, or added at the table, where the mucilage hydrates and thickens without being destroyed. This is the correct and traditional technique.
• boiling — Ruins it. Filé that is boiled goes stringy and ropy and the gumbo becomes unpleasantly slimy — a specific and well-known failure that every Louisiana cook is warned about, and the reason the pot comes off the heat first.
• grinding — Sold ground and fades quickly. The mucilage is more durable than the aroma, so an old jar will still thicken and will not smell of much.

Look at the colour and smell it. Fresh filé is sage green with an obvious woodsy aroma; old filé is brown and smells of dust, and while it will still thicken, it will contribute nothing else. Lumps in the jar mean it has taken up moisture and should be replaced.

• Brown rather than green
• No aroma at all
• Lumping or caking in the jar

• Volatilisation of the aromatic fraction
• Fading from green to brown
• Moisture uptake and caking, which affects the thickening as well as the aroma

• A fresh sage green rather than brown or khaki.
• A fine even powder with no lumps — lumps mean it has taken up moisture.
• A woodsy sassafras smell on opening.
• A small jar, because it fades and because a gumbo needs a teaspoon rather than a tablespoon.

Lauraceae

A deciduous tree of eastern North America to 20 metres or more, notable for bearing three differently shaped leaves on the same plant — unlobed, mitten-shaped and three-lobed. The whole tree is aromatic.

Eastern North America, where Sassafras albidum is native from Ontario south to Florida and west to Texas.

• United States — origin. Louisiana and the southeastern states, where both the tree and the tradition are.

Leaves picked in late summer, before they colour, when they are mature and at their most aromatic.

1. Picking — Mature green leaves picked in late summer.
2. Drying — Air-dried in shade until brittle.
3. Grinding and sieving — Dried leaves ground to a fine green powder and sieved to remove stem and vein.Why: The mucilage that does the thickening is released on grinding, and a coarse powder both thickens less evenly and is gritty.

Not cultivated as a crop. Leaves are gathered from wild and volunteer trees, which is why filé is a regional product with an informal supply chain.

Temperate deciduous forest. Sassafras is a pioneer species of forest edges and old fields and grows readily across much of the eastern United States.

Filé is a Choctaw ingredient that became a Louisiana one. Ground sassafras leaf was used as a thickener by the Choctaw and other peoples of the southeast long before French and Spanish settlement, and it entered Creole and Cajun cooking through that contact — one of the clearer cases in North American food of an Indigenous technique surviving inside a settler cuisine under a French name. Sassafras itself was a major early colonial export from Virginia, sold in Europe as a medicine on claims that did not survive examination.

A small regional trade. Sassafras was, however, one of the first significant commodity exports from the English colonies in North America, shipped to Europe as a medicinal on the strength of claims that were abandoned within a century.

Sassafras had an enormous and largely unfounded medicinal reputation in early colonial Europe, and was exported from Virginia as a treatment for a range of conditions on claims that did not hold up. The tree also has a medicinal record in southeastern Indigenous practice. Recorded as history; SpiceHQ makes no health claim.