Add cucumbers, onion, carrots, and garlic into a large bowl. Add salt and mix to ensure the vegetables are well coated with salt. Set aside and let sit for about 20 minutes.
Drain out the excess liquid that has formed at the bottom of the bowl.
Add Korean red pepper flakes ("gochu-garu"), sugar, rice wine vinegar, fish sauce, and sesame oil. Mix well then season with sesame seeds.
Serve alongside several other side dishes ("banchan") and rice.
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