Kongguksu (Korean Cold Soy Milk Noodles)
Cooked white soybeans blended with sesame seeds make a thick, nutty soy milk that is chilled and poured over somen. Skimming off the loose skins while rinsing the beans keeps bitterness out of the broth, and one pass through a sieve removes the gritty bits for a much silkier soup. Seasoning splits between salt alone and salt with a little sugar, added a pinch at a time either way. The soup needs at least 1 hour in the fridge and is blended well ahead, since ice cubes in the bowl would only thin it. The noodles get a rub in cold water and a short dip in ice water to firm them up.