Tarhana has been produced in Anatolia for at least 3,000 years — possibly the oldest processed fermented food in the world still in continuous production. Its Turkish etymology may relate to the Persian word for flour used in cooking. Versions of tarhana are found throughout the former Ottoman world: tarhana in Turkey, kishk in Syria and Lebanon, trahana in Greece. Each represents the same principle — fermenting grain and dairy together for preservation.
Tarhana — one of the oldest preserved foods in the world — is a fermented, sun-dried paste made from a combination of flour, yogurt, cooked vegetables (tomato, pepper, onion), and wild yeast, dried into crumbles or sheets and stored for months. Its double preservation (acid from fermentation + moisture removal through drying) produces a product of extraordinary stability and complex flavour. Dissolved in hot water or stock, it produces a sour, complex soup in minutes.
**The fermentation:** - Flour, yogurt, tomato, pepper, onion, and wild herbs mixed together. - Fermented at room temperature for 3–5 days — Lactobacillus from the yogurt and wild yeasts from the flour and vegetables produce lactic acid and CO₂. - The mixture is kneaded daily to incorporate the CO₂ and maintain even fermentation. **The drying:** - Small portions pressed onto a cloth and sun-dried for 5–7 days. - Traditionally crumbled by hand as they dry. **Use:** - Dissolved in water or stock with butter — cooks for 10–15 minutes until completely smooth. - The final soup should taste tangy, savoury, slightly sweet from the dried vegetables — a complex fermented umami.
The Turkish Cookbook