Sumac: Acid Agent and Colour

Ground dried sumac berries used as a souring agent, a finishing spice, a marinade component, and a colour element. Unlike lemon juice or vinegar, sumac is dry — it adds acidity without adding moisture, making it ideal for applications where liquid acidity would compromise texture.

Sumac (Rhus coriaria) grows wild across the Mediterranean and Middle East and has been used as a souring agent since antiquity — predating the widespread availability of citrus in the region. Ground from dried berries into a coarse, burgundy-red powder, it delivers tartaric acid (the same acid as in grapes and tamarind) with a distinct fruity, slightly astringent quality that no other souring agent replicates.

Sumac is the acid note that doesn't announce itself as acid — it reads as fruity and complex rather than sharp. On roasted chicken, it caramelises into the skin producing a deep, lacquered surface. In a dressing, it adds tartness without the sharpness of lemon. Sprinkled over hummus at the end, it adds both colour and brightness.

- Sumac freshness is critical — the tartaric acid dissipates over time. Fresh sumac is bright burgundy and pungent; old sumac is dull brown and flat - Used generously in Palestinian and Lebanese cooking — 1–2 tablespoons per dish is not excessive - Added at the end of cooking preserves its bright acid note; added early it mellows into background complexity - Soaked briefly in warm water extracts the acidity as a liquid — useful in dressings and marinades