Fukuoka, Japan — mentaiko introduced to Japan postwar via Korean tradition; Hakata as epicentre
Tarako (たらこ, pollock roe) and mentaiko (明太子, spicy pollock roe) are Japan's most beloved cured roe condiments — the pale pink tarako for mild applications and the chili-rubbed, deeply red-orange mentaiko for bold preparations. Both use the egg sacks of walleye pollock (Theragra chalcogramma), salt-cured to preserve and season. Mentaiko originated in Korea (myeongnan) and was introduced to Japan through Hakata (Fukuoka) in the postwar period, subsequently becoming so thoroughly Japanese that it is now considered a Fukuoka regional speciality — the city's most iconic food souvenir. Preparations: both are eaten raw, sliced, on rice; as pasta sauce (mentaiko pasta is Japan's most popular 'western-style' pasta); in ochazuke; as a filling for onigiri; as a topping for cold tofu or baked avocado; and baked in tempura preparation.
Tarako: clean, mildly salty, oceanic roe sweetness; mentaiko: bold, spicy, umami-rich, deeply satisfying heat; both have a briny marine quality that makes them quintessentially Japanese ocean flavours
Tarako is used for subtle flavour applications; mentaiko is used where bold, spicy, oceanic flavour is desired; both should be removed from the sack with a chopstick/spoon for pasta applications; for mentaiko pasta: extract roe into bowl, mix with softened butter and light soy sauce, toss with hot pasta off heat — the residual heat from pasta cooks the roe slightly from raw to just-set; temperature-sensitive: always use at room temperature, not refrigerator-cold.
Fukuoka's Kanefuku is the definitive mentaiko producer — their original marinated mentaiko is the benchmark for the style; mentaiko pasta with butter and nori is complete in 10 minutes: cook pasta al dente, drain reserving 50ml pasta water, in a bowl mix 2 mentaiko sacks (roe scraped out) + 1 tablespoon butter + 1 teaspoon light soy + pasta water, add hot pasta and toss off heat; finish with shredded nori; tarako onigiri is one of Japan's most universally beloved rice ball fillings — the mild, salty roe pairs perfectly with plain rice.
Heating mentaiko pasta sauce directly (destroys the delicate roe texture — it should be barely warmed by the pasta's residual heat); using both tarako and mentaiko interchangeably in all recipes (mentaiko is too spicy for delicate applications like somen topping where tarako is appropriate); storing mentaiko at room temperature (it must be refrigerated or frozen for safety).
Japanese Food Culture — Naomichi Ishige