Slice the lotus root thinly and soak in cold water to remove starch.
Blanch the lotus root in boiling water for 2–3 minutes, then drain and cool in a sieve.
Slice cucumber and carrot thinly.
Place lotus root, cucumber, and carrot in a bowl.
Add yuja syrup, vinegar, salt, olive oil, and lemon juice, then toss gently.
Serve on a plate and sprinkle with black sesame seeds to finish.