Jatguksu is a Korean noodle dish consisting of wheat flour or buckwheat

Buckwheat

Buckwheat refers to a variety of plants in the dicot family Polygonaceae: the Eurasian genus Fagopyrum, the North American genus Eriogonum, and the Northern Hemisphere genus Fallopia. Either of the latter two may be referred to as "wild buckwheat"...

 noodles in a bowl of cold broth made from ground pine nut

Pine nut

Pine nuts are the edible seeds of pines . About 20 species of pine produce seeds large enough to be worth harvesting; in other pines the seeds are also edible, but are too small to be of great value as a human food....

s. It is a local specialty of Gapyeong, Gyeonggi Province where a great deal of pine nuts are harvested in South Korea. The recipe is quite similar to another summer dish, kongguksu

Kongguksu

Kongguksu is a seasonal Korean noodle dish served in a cold soy milk broth. It comprises noodles made with wheat flour and soup made from ground soybeans...

, which is a noodle dish with a soy milk

Soy milk

Soy milk and sometimes referred to as soy drink/beverage is a beverage made from soybeans. A stable emulsion of oil, water, and protein, it is produced by soaking dry soybeans and grinding them with water...

broth, but jatguksu has a cleaner and more savory taste.