Add the tuna, kimchi, mayo, celery, green onion, sesame seeds and ginger to a large mixing bowl. Use a fork to combine the mixture, breaking up the tuna with the back of a fork.
Once the mixture is combined, use, or cover and refrigerate until ready to use. The kimchi tuna salad can be made up to 3 days in advance.
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Notes
How to make a tuna melt: Spread mayo on the outside of 2 bread slices. Layer cheese on one slice, then top with the kimchi tuna salad. Heat butter in a skillet, place the sandwich mayo-side down, and cook until golden, about 3 minutes. Flip and cook another 2–3 minutes, until the other side is browned and the cheese is melted.