Wash the cucumber thoroughly and slice it thinly.
Julienne the onion and carrot thinly.
Sprinkle salt over the cucumber, onion, and carrot and let them sit for 10 minutes.
Squeeze out the excess moisture from the salted vegetables.
Mix sugar, vinegar, sesame oil, and minced garlic to make the dressing.
Add the dressing to the vegetables and toss evenly.
Sprinkle sesame seeds on top to finish.