Thinly slice the cucumber and salt it for 10 minutes.
Rinse the salted cucumber in cold water and squeeze out the moisture.
Remove the membrane from the pollock roe and set aside the eggs.
Add pollock roe, cucumber, seaweed flakes, sesame seeds, and chopped green onions on top of rice.
Drizzle with sesame oil and soy sauce, then mix well before eating.