Kashk is a fermented dairy product made from cooked, concentrated yogurt. It originated in Iran and the broader Middle East, where it has been a kitchen staple for centuries. You’ll find it sold as a thick, whitish paste (similar in texture to sour cream) or as hard, dried balls and powder that can be reconstituted with water. Its flavor is intensely tangy and salty, and it serves as both a protein-rich preserved food and a cooking ingredient that thickens and seasons soups, stews, and dips.
How Kashk Is Made
The process starts with plain yogurt, sometimes left to sour for a day or two beforehand. The yogurt is blended with water and brought to a simmer, where it initially separates and curdles. Over roughly three hours of slow cooking, the mixture comes back together, darkens to a beige color, and develops a sharp, sour taste. Once cooled, the thick mixture is strained through cheesecloth or a fine mesh bag, squeezing out as much liquid as possible. That liquid is essentially whey, and what remains is kashk.
At this stage, the kashk can be stored as a thick paste. To make dried kashk, the strained paste is shaped into small balls or discs and left to air-dry, sometimes in the sun, until hard. In this dried form, kashk becomes shelf-stable for months or even years without refrigeration. Before cooking with dried kashk, you soak it in water until it softens back into a paste.
The long shelf life comes from two factors working together: the extreme acidity produced during fermentation and cooking, and the very low moisture content in the dried form. Both conditions make it difficult for harmful bacteria to grow.
Nutritional Profile
Dried kashk is remarkably nutrient-dense. Per 100 grams, it contains about 60 grams of protein, 2.4 grams of calcium, and 3.5 grams of phosphorus, with only 5.2 grams of fat and about 13 grams of moisture. That protein concentration is higher than most cheeses and rivals protein powder, which makes sense: you’re essentially eating concentrated, fermented milk solids with most of the water removed.
The calcium and phosphorus levels are also unusually high, reflecting the mineral density of the original milk compacted into a fraction of its volume. Keep in mind that you typically use kashk in small amounts as a flavoring or topping, so you won’t eat 100 grams in a sitting. Still, even a few tablespoons add meaningful protein and minerals to a dish.
Beneficial Bacteria in Kashk
Like yogurt and kefir, kashk harbors live bacterial cultures produced during fermentation. Microbiological analysis of traditional Iranian kashk samples has identified a diverse community dominated by lactic acid bacteria. The most abundant genus is Lactobacillus, making up roughly 57% of the bacterial population, followed by Pediococcus at about 14% and Streptococcus at 12%.
Several of these strains have shown probiotic potential in laboratory studies. One notable finding is the high presence of Pediococcus acidilactici, a species more commonly associated with fermented grains than dairy products, which has attracted interest as a promising probiotic. The liquid (paste) form of kashk retains more of these live cultures than the fully dried version, where the dehydration process reduces viable bacterial counts.
Regional Names and Variations
Kashk goes by different names across a wide geographic belt stretching from the Eastern Mediterranean to Central Asia. In Afghanistan and parts of Central Asia, the dried form is called qurut (or kurut). In Jordan and the Levant, a similar product made from goat or sheep yogurt is known as jameed, often used to make the national Jordanian dish mansaf. Armenian communities call their version chortan.
Turkey produces closely related products under names like keşk, kesük, or kiş. While the basic principle is the same everywhere (ferment milk, cook it down, dry it), the specific milk source varies by region. Iranian kashk traditionally uses cow or sheep milk. Jameed typically comes from goat milk. These differences in source milk give each regional variety its own flavor profile and fat content.
How Kashk Is Used in Cooking
In Persian cuisine, kashk plays two roles: it thickens dishes and adds a deeply savory, tangy flavor that no other single ingredient replicates. Its taste sits somewhere between sharp parmesan, thick yogurt, and blue cheese, with a fermented complexity that deepens whatever it touches.
The most iconic dish featuring kashk is kashk-e bademjan, a warm eggplant dip where roasted eggplant is mashed with fried onions, garlic, and mint, then finished with a generous drizzle of liquid kashk on top. It’s served as an appetizer or side with flatbread. Ash reshteh, a hearty noodle and herb soup traditionally eaten during Persian New Year, gets its finishing touch from a swirl of kashk stirred in at the table. Kale joush is another traditional dish that relies on kashk simmered with herbs and walnuts.
Beyond these classics, kashk works as a general-purpose flavor enhancer. The dried powder can be crumbled into soups and stews to add body and umami, or reconstituted into a paste and stirred into rice dishes and sauces. Think of it as a fermented dairy seasoning: a small amount transforms a dish the way a splash of good vinegar or a grating of aged cheese would.
Where to Find Kashk
Outside the Middle East, your best bet is a Persian or Middle Eastern grocery store, where kashk is sold in jars (liquid form) or as dried balls in plastic packaging. Some online specialty retailers carry it as well. The jarred liquid version is the most convenient for cooking, since it’s ready to use straight from the container. If you buy dried kashk, plan to soak it in warm water for several hours until it dissolves into a smooth paste before adding it to recipes.
Homemade kashk is also straightforward if you have patience. A batch starts with about a quart of whole-milk yogurt and takes roughly three to four hours of active cooking and straining. The result keeps in the refrigerator for weeks in paste form, or indefinitely if dried completely.