오이 미역 냉국 is Korean culinary culture’s specialized soup that is served with cold water made of cucumber slices and seaweed ingredients. The 냉국’s 냉 is 冷 which means cold, popular dish for summer hot days and elimination of thirstiness in the hot weather.
It is good for the purpose of elimination as well as maintaining the tastes of raw food material because heat is not used to make them. The waterly cucumber and seaweed are good for bite size and sweet and sour soup waters are also good for drinking. Sometimes it is served with the state of half-melted ices, it is common way of serving in Korea to display the cold feelings to the taking of the foods. (i.e. 냉면 with ice)
The cooking is also very simple. We cut the ingredients into bite size and prepare for serving, and put salt, sugar, vinegar into the plain water to mix the water with the ingredients. The sesame would be combined ingredient for finishing the bowl.
Many cooks would like to add more seasonings to better chance of tastes of it, it would be craftmanship if you find out your way to do it.
This is also common way starting Korean cuisine, so is recommended strongly to the purpose.