Oi-naengguk (Cold Cucumber Soup)

At the Suwon market, cucumbers told you summer had stopped being gentle. They were piled in green ridges, prickly Korean oi still cool from the morning truck, and every home cook knew one bowl that asked for no fire. Oi-naengguk is that bowl: cold cucumber soup, sharp with vinegar and soy, plain enough to make beside rice while the kitchen stays quiet.

The dish lives or dies by two small disciplines: cut the cucumber into narrow matchsticks, and season the broth stronger than you think before the ice goes in. Thick cucumber slips off the spoon. Warm or dull broth turns the soup into watered salad. I salt the cucumber for five minutes, not to soften it, but to wake its own juice and let the garlic and scallion cling.

Notebook 18 says 2 cups water, 2 tablespoons vinegar, 1 tablespoon soup soy sauce, 2 teaspoons sugar, and 1/4 teaspoon salt for one large cucumber. That looks fussy until August, when the table is tired and everyone still needs to eat. 손맛 is real; I measure it anyway, so your cold soup can taste the same tomorrow.