Hapanvelli is a traditional South-Eastern Finnish dish that resembles pea soup

Pea soup

Pea soup or split pea soup is soup made, typically, from dried peas. It is, with variations, a part of the cuisine of many cultures. It is greyish-green or yellow in color depending on the regional variety of peas used; all are cultivars of Pisum sativum.Pea soup has been eaten since antiquity; it...

 but has a more sour flavour. It takes roughly an hour to prepare hapanvelli which is made from a rye

Rye

Rye is a grass grown extensively as a grain and as a forage crop. It is a member of the wheat tribe and is closely related to barley and wheat. Rye grain is used for flour, rye bread, rye beer, some whiskeys, some vodkas, and animal fodder...

 sourdough

Sourdough

Sourdough is a dough containing a Lactobacillus culture, usually in symbiotic combination with yeasts. It is one of two principal means of biological leavening in bread baking, along with the use of cultivated forms of yeast . It is of particular importance in baking rye-based breads, where yeast...

 starter, potatoes and peas

PEAS

P.E.A.S. is an acronym in artificial intelligence that stands for Performance, Environment, Actuators, Sensors.-Performance:Performance is a function that measures the quality of the actions the agent did....

. It is traditionally served with a pat of butter and cold milk.

Hapanvelli is a traditional dish of the Virolahti

Virolahti

Virolahti is the southeastern-most municipality of Finland on the border of the Russian Federation. It is located in the province of Southern Finland and is part of the Kymenlaakso region. The municipality has a population of and covers an area of of which is water...

 municipality which has the annual summertime Virolahti Week (Virolahti-viikko) during which hapanvelli is sold. There is also a contest during Virolahti Week in which the best cook gets the title of Miss Hapanvelli (Hapanvellimissi).