Japan — Ibaraki Prefecture, Nakaminato fishing port; particularly celebrated in Hitachi City and surrounding areas during winter months December–February
Anko (monkfish, Lophiomus setigerus) is one of Japan's most prized winter fish — primarily celebrated for its liver (ankimo, called the foie gras of the sea) and its firm, sweet, lobster-like tail flesh. Ibaraki Prefecture, particularly Nakaminato port, is the monkfish capital of Japan. Anko-nabe (monkfish hot pot) is the iconic winter preparation: monkfish pieces, ankimo, and vegetables simmered in a miso-based broth, eaten communally around the pot. Ankimo (monkfish liver) is served separately as a premium appetiser — steamed and thinly sliced, it has a remarkably rich, unctuous texture with an oceanic, sweet, deeply savoury flavour.
Ankimo: intensely rich, creamy, oceanic-savoury, unctuous; anko flesh: sweet, firm, mild; broth: miso-sweet with fish depth and gelatinous richness
Anko has no scales and minimal bones — its firm, white, gelatinous flesh holds up exceptionally well to simmering. The traditional processing: anko is hung from the ceiling and butchered suspended (tsurikiri technique) because it is too slippery to cut flat on a board. Seven parts of anko are consumed: flesh, liver, skin, stomach, gills, ovaries, and cheeks. Ankimo preparation: rinse liver, remove blood vessels, salt lightly, roll in plastic wrap to form a cylinder, steam 20 minutes, cool, slice. The miso in anko-nabe should be a blend of white and red miso for depth without heaviness.
Ankimo is at its best dressed with momiji oroshi (grated daikon with chilli) and ponzu — the richness of the liver requires the acid cut of ponzu and the heat of chilli to balance. In Ibaraki, look for 'anko matsuri' festivals in January and February when fresh anko arrives in peak condition. The skin of monkfish, simmered until gelatinous, is prized as a separate component — it has the consistency of thick, savoury jelly. Add miso to the anko-nabe broth in stages, adjusting saltiness as the pot concentrates.
Using frozen ankimo — the texture deteriorates significantly. Overcooking the anko flesh in the hot pot, which makes it rubbery. Adding ankimo directly to the pot without pre-steaming separately — it will dissolve into the broth rather than remaining as a distinct ingredient. Using only red miso in the broth, which overwhelms the sweet anko flavour.
Tsuji, Shizuo — Japanese Cooking: A Simple Art; Davidson, Alan — The Oxford Companion to Food; Ibaraki Prefecture fishing documentation