Kishk Fermentation

Kishk is one of the ancient Levantine world's most sophisticated preservation technologies: a co-fermentation of cracked wheat (burghul) and fresh yogurt or Leben that produces a deeply acidic, protein-dense, shelf-stable food through lactic acid bacterial activity. The process begins by mixing fine burghul with generous amounts of fresh sheep's or goat's milk yogurt (traditionally at ratios of roughly 1:2 to 1:3 grain to yogurt by weight) and salt. The mixture is kneaded daily for seven to ten days, fermenting at ambient temperature as Lactobacillus and Streptococcus cultures acidify the mass, break down phytic acid in the wheat, and begin pre-digesting proteins into free amino acids. This acidification is both the flavor engine and the preservation mechanism: pH drops below 4.0, inhibiting pathogenic and spoilage organisms. The fermented mass is then spread onto clean cloths or trays and sun-dried over several days, concentrating flavor and reducing water activity to the point where the product keeps for a year or more at room temperature. The dried kishk is crumbled or ground to a coarse powder, amber-beige in color, with an aggressively sour, cheesy, and savory aroma. In Lebanese and Syrian kitchens it is used as a soup base (kishk soup, often with caramelized onions and sometimes pork or chicken fat), a breakfast paste with olive oil and tomatoes spread on flatbread (ka'ak bi kishk), or a seasoning rubbed onto roasted meats. The free glutamates produced during fermentation give kishk pronounced umami depth, and its high acid content acts as a tenderizer when used as a marinade. It is distinct from Iranian kashk (a dried whey product) and from Turkish tarhana, which is a related but differently formulated grain-yogurt ferment.

“A tablespoon of kishk stirred into the sautéed onions dissolved quickly and turned the pan amber, releasing a sharp, funky perfume that formed the backbone of the soup.”

• ingredientsBurghul
• CuisineLevantine
• ConceptLactic Acid Fermentation

1. 1.The Art of Fermentation — Sandor Ellix Katz
2. 2.Zaitoun: Recipes from the Palestinian Kitchen — Yasmin Khan
3. 3.Feast: Food of the Islamic World — Anissa Helou
4. 4.Jerusalem — Yotam Ottolenghi & Sami Tamimi
5. 5.Oxford Companion to Food — Alan Davidson

Confidence: high