More detailed recipe is on my website: https://www.maangchi.com/recipe/chamchi-gimbap
I’ve been making tuna gimbap this way for a long time. The flaky, salty, and sweet tuna tastes delightful and goes well with rice and the other fillings: avocado, yellow pickled radish, and crab sticks. The various tastes and textures make for a lot of variety in one bite!