Beat the eggs and make an omelette.
Julienne the cucumber, sprinkle with salt, and drain excess water.
Drain oil from the tuna using a sieve.
On the seaweed, place cheddar cheese, egg omelette, cucumber, and tuna.
Sprinkle a little mozzarella cheese.
Roll the gimbap tightly as you would for regular gimbap.
Slice into bite-sized pieces.