Bonito flakes.
Aside from normal use in Asian cuisine, I like to grind it to a fine powder to add extra flavor to foods. Add to ramen, rice, soup, whatever. Grind it as is, or flavor it with soy sauce and/or sugar and bake till dry then grind. Make your own furikake (soy sauce, sugar, nori, sesame seeds, etc). Both cats and dogs love eating it too (as is, not ground).
Just remember its price to volume ratio when using in ground form