Sumac

• summaq

  Arabic

• sumak

  Turkish

• sumak

  Hebrew

Sharply sour with a fruity, almost cranberry-like character and a tannic, mouth-drying finish. The sourness is clean and lingering, without the sharp immediacy of vinegar, and unlike lemon it brings no bitterness from peel and no liquid at all — which is exactly why it is used where a wet acid would ruin the texture.

Faint. A light fruity, slightly resinous smell with a tannic edge, but sumac is nearly silent in the jar compared with the aromatic spices, and its aroma is not what it is for.

Deep brick to burgundy red, slightly purple in good material. Colour is the first thing to go: dull brown-red sumac is old, and unnaturally bright uniform crimson suggests added colourant.

A slightly damp, coarse purple-red powder that clumps rather than flows. Good sumac is faintly sticky from the fruit itself; a bone-dry free-flowing powder usually means salt, anti-caking agent or age.

• Malic acid — A principal contributor to the sourness, and part of why it reads as fruit-sour, not vinegar-sour.
• Citric and tartaric acids — Further organic acids contributing to the total acidity.
• Tannins — The astringent, mouth-drying finish, and the reason the plant was historically valuable for tanning leather.
• Anthocyanins — The deep red colour, and the part that fades first with age and light.

Add it late or at the table. Sumac loses colour and brightness under prolonged heat, so it belongs in a finishing dusting, a dressing or a rub applied near the end rather than in a spice base bloomed at the start. Where the grittiness matters — in a smooth dressing, say — steep it in a little warm water for a few minutes and use the strained red liquid instead. If the sumac is salted, reduce the salt elsewhere in the dish accordingly, and be aware that a salted product cannot be measured as though it were pure spice.

Sumac is a souring agent first and a spice second. Its distinctive value is that it delivers acidity as a dry powder: it can be dusted over grilled meat, folded through a salad, rubbed onto chicken or scattered over hummus and flatbread without adding a drop of liquid or a trace of bitterness. That makes it the natural choice wherever lemon would work but would also make something soggy. It is a principal component of za'atar, the defining note of fattoush and musakhan, and a standard table condiment across Turkey and Iran. It works particularly well with grilled lamb and chicken, with raw onion, with chickpeas, with yoghurt, with tomato and cucumber, and alongside olive oil.

• toasting — Not done, and not useful. Sumac is already ground, contains little volatile aroma to develop, and heat dulls both the acidity and the colour. Treating it like a seed spice wastes it.
• boiling — Prolonged cooking flattens sumac considerably, costing both colour and brightness. It belongs at the end of cooking or at the table, not at the start.
• blooming — Steeping sumac in warm water for a few minutes and using the strained red liquid is a documented Levantine and Persian technique, and extracts the acidity and colour while leaving the grittiness behind.

Look and taste. Good sumac is deep red-purple and faintly damp, and a pinch on the tongue is immediately and cleanly sour. Dull brown powder that tastes mainly of salt or of nothing has either aged or was never mostly sumac.

• Colour turned dull brown instead of red-purple
• Hard clumps that will not break up
• Weak or absent sourness on the tongue
• A predominantly salty taste, which indicates composition, not age

• Fading of anthocyanin colour under light and over time
• Moisture uptake, caking and clumping
• Gradual loss of the fruity top notes, leaving flat tannic sourness

This is the one common spice where the usual "buy whole" advice mostly does not apply. Whole sumac drupes are hard to source outside Middle Eastern grocers and awkward to grind well, because the aim is to mill the flesh while excluding the hard seed — which is a job for a mill and a sieve, not a domestic grinder. Buying ground is the normal and reasonable choice. Spend the effort instead on buying unsalted sumac from a supplier that states its origin, and on buying small quantities often, since colour is what fades.

• Deep red-purple colour, not brown and not an unnaturally uniform bright crimson.
• A slightly damp, clumping texture, not a free-flowing dry powder.
• An ingredients list reading "sumac" alone, with any salt declared and quantified.
• Immediate clean sourness when a pinch is tasted, without a salty first impression.
• Few visible pale seed fragments.

There is no widely used consumer grading standard for sumac. Buying decisions rest on origin, on the ingredients list and on the colour and texture of the powder itself, which is a weaker position than for spices with formal grading schemes and should be recognised as such.

Anacardiaceae

A shrub or small tree of the Mediterranean and West Asia bearing dense upright clusters of small red drupes covered in fine hairs. Much of the crop is still gathered from wild and semi-wild stands, not from formal plantations.

The Mediterranean basin and West Asia, with the plant growing wild across a broad arc from Sicily through Anatolia to Iran.

• Turkey — major producer. The principal commercial source of culinary sumac.
• Iran — major producer
• Syria — notable producer
• Lebanon — notable producer
• Italy (Sicily) — historic producer. Long a source of sumac for tanning as well as for food; "Sicilian sumac" survives as a trade description.

The fruit clusters are cut when the drupes have ripened to deep red, generally in late summer and early autumn, and dried before grinding.

1. Harvesting clusters — Whole fruiting clusters are cut once the drupes have reddened.
2. Drying — Clusters are dried, traditionally in the sun.Why: Reduces moisture so the fruit can be milled and stored.
3. Grinding — The dried drupes are milled, with the hard inner seed separated out as far as possible.Why: The sour, coloured flesh is the product; the seed contributes grittiness and little flavour.
4. Sieving and blending — The ground fruit is sieved. Salt is added at this point in many commercial products, and oil is sometimes added to keep the powder from caking.Why: Sieving removes seed fragments. Salting is a commercial decision, not a processing necessity.

There is no widely recognised consumer grading standard comparable to the saffron or pepper schemes. In practice quality is judged on colour depth, moisture and stickiness, coarseness, the proportion of seed fragments, and above all whether salt has been added and in what quantity.

Sumac is among the more routinely adulterated spices on the shelf, and in ways a buyer can partly detect. Salt is added freely, sometimes to a substantial fraction of the packet, and is not always declared prominently. Citric acid is added to restore sourness to weak material. Red colourants and beetroot are used to deepen colour that has faded. Ground seed and other plant matter bulk it out. The combination of no established grading standard, a wild-harvested supply and a product whose two selling points — sourness and colour — are both cheap to fake makes this predictable.

Substantially wild-harvested or gathered from semi-managed stands, with little intensive cultivation — unusual among traded spices and part of why quality varies so widely between suppliers.

Hot, dry Mediterranean and semi-arid conditions. The plant is drought-tolerant and grows on poor stony ground where more demanding crops would not.

Sumac was used as a souring agent across the eastern Mediterranean and West Asia long before lemons reached the region, and it kept that role afterwards instead of being displaced by them. Classical sources record it as both a food and a tanning material, and the species epithet coriaria — "of leather" — preserves the second use in the name itself.

Sumac has never been a long-distance luxury commodity in the way the tropical spices were. Its historically significant trade was industrial, not culinary — Sicilian sumac was an important tanning material for European leather before synthetic tannins displaced it — while the culinary trade remained largely regional and remains poorly captured in production statistics.