Umu-naengguk (우무냉국, Cold Agar Jelly Soup)

High summer is when umu belongs on the table. In the market it sits in pale blocks, softer than muk and quieter than tofu, and people walk past because it looks like nothing. That is its nature. Umu-naengguk is almost all texture, so the cook's work is not to decorate it but to cut it long and make the broth cold and sharp enough to wake it.

Master Seong-nyeo made us cut the jelly with the same patience she gave to japchae vegetables, long slivers no wider than a matchstick. Short pieces sink and disappear. Long ones carry the vinegar and chill to the spoon, which is why the knife work matters in a dish that has no heat and almost no cooking.

This is a weeknight summer bowl, often eaten when rice feels heavy and the kitchen should not get hotter. Buy the umu-muk if your market has it; that corner is safe to cut. Do not shorten the chilling, and do not guess at the seasoning. 손맛 is real; I measure it anyway, because a clear broth has nowhere to hide too much soy sauce or too little vinegar.