Slice cucumber and carrot into long strips.
Wash sea staghorn thoroughly and drain the water.
Mix rice with salt and sesame oil.
Drain the oil from tuna using a strainer, then mix with mayonnaise.
Lay sea staghorn and seaweed on the bamboo mat.
Spread rice thinly on top.
Add ingredients (cucumber, carrot, tuna, pickled radish) on top.
Roll tightly and slice.