(Sorry in advance for the lack of proper tags, I’m not sure how to add them on mobile)

So I tend to eat a can of tuna once or twice a week, usually with just a little salt, pepper and a dab of kewpie mayo and stuffed into onigiri. Are there any spices or sauces I can add to make it more interesting? Or any other easy tuna recipes I can make for one, preferably with rice? I really enjoy spicy foods and fermented/pickled things, but I’m not sure the best ways to combine that with something like tuna.