|Region or state||Central and Eastern Europe, Baltic states and Finland|
|Main ingredients||Sweetened juice, arrowroot, cornstarch or potato starch|
Kissel or kisel (Estonian: kissell, Finnish: kiisseli, Livonian: kīsõl, Latgalian: keiseļs, Latvian: ķīselis, Lithuanian: kisielius, Polish: kisiel, Russian: кисель, tr. kiselʼ, Ukrainian: кисiль, kysilʼ, Belarusian: кісель, kisielʼ) is a viscous fruit dish, popular as a dessert and as a drink in Northern, Central and Eastern Europe. It consists of the sweetened juice of berries, like mors, but it is thickened with cornstarch, potato starch or arrowroot; sometimes red wine or fresh or dried fruits are added. It is similar to the Danish rødgrød and German Rote Grütze. Swedish blåbärssoppa is a similarly prepared bilberry dessert.
Kissel can be served either hot or cold, also together with sweetened quark or semolina pudding. Kissel can also be served on pancakes or with ice cream. If the kissel is made using less thickening starch, it can be drunk — this is common in Poland, Russia and Ukraine.
Its name is derived from a Slavic word meaning "sour", after a similar old Slavic dish — a leavened flour porridge (or weak sourdough) which was made from grain — most commonly oats, but any grain, and even legumes like peas or lentils could be used, though bean kissels usually weren't leavened — and lacked the sweetness of the modern variants. Kissel is first mentioned in the old East Slavic Primary Chronicle where there is a story of how it saved the 10th-century Rus' city of Bilhorod, besieged by nomadic Pechenegs in 997. When the food in the city became scarce and a hunger started, the inhabitants of the city followed an advice of an old man, who told them to make kissel from the remnants of grain, and a sweet drink from the last mead they could find. Then they filled a wooden container with the kissel, and another one with the mead drink, put those containers into the holes in the ground and made up two fake wells over them. When the Pechenegian ambassadors came into the town, they saw how the inhabitants took the food from those "wells", and the Pechenegs even were allowed to taste the kissel and mead beverage. Impressed by that show and degustation, Pechenegs decided to lift the siege and to go away, having concluded that the Ruthenians were mysteriously fed from the earth itself.
Nowadays most Polish households prepare kissel from instant mixes instead of the traditional way. The most popular flavours are strawberry, gooseberry, and raspberry. In Russia, the most popular flavours are cranberry, cherry, and redcurrant. Cranberry kissel (Lithuanian: spanguolių kisielius) is a traditional meal on Kūčios (Christmas Eve supper) in Lithuania. In Finland, kissel is often made of bilberries (since those can often be found growing wild in the forests and are thus both easy to gather and free) as well as from prunes, apricots, strawberries, etc. The thickness can vary depending on how much potato flour is used: thin bilberry soup is most easily consumed by drinking while the thickest version is almost like jelly and is eaten with a spoon. Rhubarb can also be used, but it is often combined with strawberries to make it less tart. Kuningatarkiisseli ("Queen's kissel") is made with mixed berries and berry juices, usually at least bilberries and raspberries. Prune kiisseli (luumukiisseli) is traditionally eaten with rice pudding at Christmas. Milk kiisseli (maitokiisseli) is another variant, made from milk and flavoured with sugar and vanillin (or vanilla).
In Russian fairy tales, the land of marvels (similar to Cockaigne) is described as the land of "milk rivers and kissel banks". This expression became an idiom in Russian for prosperous life or "paradise on earth".
Another phrase common in Russia and Poland, "the seventh water after kissel" (Polish “siódma woda po kisielu”), is used to describe a distant relative.