Julienne the cucumber and carrot.
Drain the oil from the canned tuna using a strainer, then mix with mayonnaise and salt.
Season the cooked rice for kimbap with salt and sesame oil.
Spread the rice evenly over the seaweed sheet.
Add cucumber, carrot, tuna, pickled radish, and other fillings.
Roll up the kimbap tightly.
Cut into bite-size pieces.