Julienne the cucumber, sprinkle it with salt, and let it sit to remove excess moisture.
Beat the eggs, cook them into a thin omelette, and slice into strips.
Drain the tuna and mix it with mayonnaise.
Spread the rice thinly over a sheet of seaweed.
Layer the cucumber, egg strips, and tuna-mayo mixture on top of the rice.
Roll the kimbap tightly.
Slice into bite-sized pieces.