Wash the cucumber thoroughly and slice it thinly
Slice the onion thinly
Put the cucumber and onion in a bowl, sprinkle with salt, and let sit for 5 minutes
Mix cold water with vinegar, sugar, and salt to make the broth
Lightly squeeze out the moisture from the marinated cucumber and onion, then add them to the broth
Add minced garlic and ground sesame seeds and mix
Serve with ice to keep it cold