Slice the lotus root thinly and soak it in cold water.
Blanch the lotus root in boiling water with a pinch of salt for 2 minutes.
Drain the blanched lotus root in a strainer to remove excess water.
Julienne the carrot thinly, and slice the cucumber into thin half-moons.
In a bowl, mix the lotus root, carrot, cucumber, mayonnaise, vinegar, sugar, and salt evenly.
Transfer to a plate and sprinkle with sesame seeds to finish.