Wash the water parsley thoroughly and cut it into 5cm pieces.
Thinly slice the onion.
Julienne the carrot finely.
Blanch the water parsley in boiling water for 30 seconds, then rinse in cold water and drain.
Place water parsley, onion, and carrot in a bowl. Add vinegar, salt, minced garlic, and sesame oil, then mix well.
Transfer to a plate and sprinkle with toasted sesame seeds.