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Kyselo is a sour soup from the Krkonoše mountains made with bread sourdough (kvásek). The sourdough is thinned with lukewarm water and left for several hours or overnight to sour further, then simmered into a broth of mushrooms, caraway and potatoes, finished with fried onion and served with eggs.
A short entry: the sources we found record only what is said here about Kyselo itself.
Short entryCereals and bread30 min
Recipe
Amounts from a sourceAmounts are a home recipe published on CzechTourism's Kudy z nudy site; family versions vary.
What changes:Bread sourdough thinned with warm water is left to sour overnight
Step 1 of 4
Thin the sourdough with lukewarm water and leave it to sour
Time
Several hours, best overnight
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Output: sour sourdough liquid.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
At a glance
Kyselo is a sour soup from the Krkonoše mountains made with bread sourdough (kvásek). The sourdough is thinned with lukewarm water and left for several hours or overnight to sour further, then simmered into a broth of mushrooms, caraway and potatoes, finished with fried onion and served with eggs. Made in 4 steps over 30 min. The longest step, add the soured sourdough and simmer; stir in fried onion, takes 30 min (Novinky.cz).
Baker's sourdough or dried starterOne recipe uses paste sourdough bought from a baker; dried starter must be soaked at least an hour ahead, ideally a day.
Safety
The sour liquid is simmered in the soup. In one recipe raw eggs are stirred into the fried onion so that they stay partly raw, then stirred into the soup and boiled only briefly (Novinky). The CzechTourism recipe serves runny scrambled or poached eggs. The FDA says to cook eggs until both yolk and white are firm, and that scrambled eggs should not be runny, to prevent illness from bacteria.
Kudy z nudy lists kyselo among the traditional dishes of the Krkonoše, where housewives made do with plain foods. It says a saying held that people got up with kyselo and went to bed with kyselo.