Refreshing Cold Cucumber Soup

This is oi naengguk territory, the classic Korean chilled cucumber soup that shows up on the table when temperatures climb and nobody wants to turn on a stove. The cucumbers go in raw and paper-thin, and the hour-long marinade in soy sauce, vinegar, and sesame oil is what carries the flavor deep into every slice before the broth hits.

The toasted sesame seeds at the end are not just garnish. Toasting until they pop releases their nutty oils, which perfume the surface of the soup.

Korean chili powder (gochugaru) brings warmth without burn. Cayenne pepper is a fine substitute at half the quantity, but the flavor profile shifts toward heat-forward instead of fruity-warm.

Pro Tips

• Slice the cucumbers as thin as you can. A mandoline gets you to translucent in seconds.
• Use a cold homemade or low-sodium chicken broth so the soy sauce doesn’t push the salt over the edge.
• Don’t skip the resting hour, it’s where the flavor builds.
• Grind the toasted sesame seeds in a mortar or spice grinder rather than leaving them whole, the aroma lifts dramatically.

Variations

• Sub vegetable stock or plain ice water for a vegan version.
• Use rice vinegar in place of white vinegar for a milder, slightly sweeter tang.
• Add a handful of shredded Korean seaweed (gim) at the end for extra umami.