Lophius litulon
ingredient / ingredient-ankimo
あんきも
Anglerfish liver (including Lophius litulon) prepared by boiling in salted water, steaming, or similar methods. Fish whose livers enlarge in winter are prized. The dictionaries and local-food materials consulted go no further than descriptions such as "prized"; no explicit description of bitterness was found.
Photographs (captions in Japanese)
Sliced ankimo served in dashi broth, garnished with sliced green onion and condiments
Prepared formShown: Anglerfish (monkfish) (written in the source as Ankimo or monkfish liver)Part / state: Salt-boiled, shaped ankimo cut into rings. 3 slices served in a small bowl, soaked in dashi broth and topped with sliced green onion and condiments
Photo: Anyarei / CC BY 3.0 / original image / ledger's original image
Scope and provenance of the photo
Identification: Identified as labelled in the source. The description explicitly states "Ankimo or monkfish liver". Original size 2592x1944. I opened the image and confirmed. 3 slices of ankimo cut into rings are served on a square dish with dashi broth
Image shown: The original from Wikimedia Commons, reduced to 2400 px on the long side. No cropping or color changes. For display, a WebP capped at 1200 px wide is served; the ledger's original image can be checked from the link above.
On this page (8 sections)
Reading the bitterness
「あん肝」 (ankimo, also written 「鮟肝」) is anglerfish liver, including liver from Lophius litulon, prepared by boiling in salted water or steaming; fish with enlarged livers in winter are prized. 「デジタル大辞泉」 (Digital Daijisen) defines it as 「アンコウの肝臓。塩ゆでして水にさらし、薄切りにして、わさび醤油で食べたり、味噌あえにしたりする」 (in translation: "Anglerfish liver. Boiled in salted water, soaked in water, and sliced thinly; eaten with wasabi soy sauce or mixed with miso"). 「精選版日本国語大辞典」 (Seisenban Nihon Kokugo Daijiten) describes it as 「鮟鱇の肝臓。酒の肴などに珍重される」 (in translation: "Anglerfish liver. Prized as an accompaniment to alcohol, among other uses"). 『世界の料理がわかる辞典』 (in translation: "Dictionary of World Cuisine") also states 「酒の肴として好まれる」 (in translation: "favored as an accompaniment to alcohol"), but none of the 3 dictionaries consulted explicitly defines its taste as bitter or slightly bitter.
One local dish is 「あんこうの共酢」 (ankō no tomozu; in translation: "anglerfish with tomozu sauce") from Ibaraki Prefecture. The liver is fried to release its fat, ground, and combined with miso, sugar, and vinegar in a sauce served with boiled anglerfish flesh and other ingredients. It is described as an offering from the Mito Domain in the Edo period, and anglerfish liver is described as one of the five great delicacies under the name 「三鳥二魚」 (in translation: "three birds and two fish"). In Soma City, Fukushima Prefecture, 「あんこうのとも和え」 (ankō no tomoae; in translation: "anglerfish dressed with its liver") is made by frying and breaking up ankimo, seasoning it with miso and sugar, and mixing it with the flesh, dried daikon, and wakame. It is traditionally described as a treat for people who helped with rice planting. Neither Ministry of Agriculture, Forestry and Fisheries description mentions bitterness.
The 3 Japanese-language dictionaries consulted and the 2 entries on anglerfish dishes from Ibaraki and Fukushima Prefectures in the Ministry of Agriculture, Forestry and Fisheries’ 「うちの郷土料理」 (in translation: "Our Local Cuisine") give descriptions such as 「珍重」 (in translation: "prized") and 「酒の肴として好まれる」 (in translation: "favored as an accompaniment to alcohol"), but no explicit description of bitterness or slight bitterness was found. These materials provide no basis for a bitterness claim, so none is made here. More specialized sources may contain different descriptions.
There is also an example that measured the rupture stress related to hardness after heating. One study froze commercial Chinese-produced ankimo at -40°C, thawed it, and heated 30 g pieces in distilled water at 95-100°C for 7 minutes. Measuring 5 samples each of raw and heated ankimo, 3 times each, the rupture stress increased 1.6-fold, from 2.39×10^5 Pa to 3.80×10^5 Pa. This is a result for a single commercial-product condition and needs to be read separately from the physical properties of a steamed dish.
In the same study, 15 g each of ankimo and tiger pufferfish liver, both heated for 7 minutes, were presented to 8 female teaching staff in their 20s to 50s. Appearance, odor, oiliness, and taste, along with preference for appearance, aroma, taste, texture, and overall impression, were compared on a 5-point scale, and there was no significant difference for any item. However, 「味」 (in translation: "taste") is a broad item, and this was not a test that measured bitterness alone.
Even for the same liver, how it is handled changes with the dish. Ibaraki Prefecture's winter-fish feature introduces a fisherman's-meal dish, in which the liver is dry-roasted and then simmered, as 「どぶ汁」 (dobu-jiru). Tomozu, on the other hand, as introduced by the Ministry of Agriculture, Forestry and Fisheries, is made by frying the liver to release its fat, then grinding it and combining it with miso, sugar, and vinegar. The 2 dishes diverge in process: simmering it into a hot pot, or grinding it into a vinegar-miso sauce.
Sources for this overview
鮟肝(アンキモ)とは — デジタル大辞泉・精選版日本国語大辞典・世界の料理がわかる辞典
Checked for this overview: Used the definitions from 3 Japanese-language dictionaries verbatim. / Explicitly noted that the dictionary definitions contain no bitterness terms.
Checked for this overview: Used the preparation and history of Ibaraki’s tomozu dish. / Explicitly noted that the Ibaraki material contains no bitterness terms. / Used to describe how this differs from the existing tomozu process of the liver with miso, sugar, and vinegar.
Checked for this overview: Used the preparation and history of Fukushima’s tomoae dish. / Explicitly noted that the Fukushima material contains no bitterness terms.
Checked for this overview: Used for the commercial Chinese-produced sample, the freezing and thawing, the heating conditions, the number of samples, the rupture stress, and the limits on applicability. / Used for the amount presented, the panel conditions, the evaluation items, the absence of a significant difference between samples, and the qualification that bitterness was not separated out.
Checked for this overview: Used for the dry-roasting and simmering process of the liver in Ibaraki Prefecture's dobu-jiru.
Other names: 鮟肝 (ja)
Structured claims — open a section to read each claim's confidence, evidence and limits
Sensory (2)
Scope: The 3 dictionaries consulted this time and 2 Ministry of Agriculture, Forestry and Fisheries local-dish resources
Note: An honest record of a negative finding, based on NIGAMI LAB's collection discipline of not bending a source that only says "koku" (rich depth of flavor) into a claim of bitterness. A wider set of sources (academic journals, specialist cookbooks, and the like) might turn up a different description.
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ingredient-ankimo —has_insufficient_evidence_for→ (the claim sentence above)Scope: The comparison of commercial Chinese-produced ankimo and land-farmed tiger pufferfish liver in Mineki et al. 2009, with 8 female teaching staff
Note: 「味」 (in translation: "taste") is a broad evaluation item, and bitterness intensity was not measured independently. This is limited to an 8-person single-institution panel and a single commercial ankimo sample, and the absence of a significant difference is not proof of equivalence.
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ingredient-ankimo —has_sensory_response→ (the claim sentence above)How processing and cooking change it (4)
Scope: Ministry of Agriculture, Forestry and Fisheries, 「うちの郷土料理」 (in translation: "Our Local Cuisine"), Ibaraki Prefecture.
Note: The body of this page does not mention bitterness or slight bitterness.
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ingredient-ankimo —is_prepared_by→ (the claim sentence above)Scope: Ministry of Agriculture, Forestry and Fisheries, 「うちの郷土料理」 (in translation: "Our Local Cuisine"), Fukushima Prefecture.
Note: The body of this page does not mention bitterness or slight bitterness. The origin as a dish served to rice-planting helpers is presented as tradition; its date has not been verified in primary historical records.
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ingredient-ankimo —is_prepared_by→ (the claim sentence above)Scope: The comparison sample of ankimo in Mineki et al. 2009. The rupture test measured 5 raw and 5 heated samples, each 3 times
Note: The main object of the study was tiger pufferfish liver; ankimo was a comparison sample under a single commercial-Chinese-product condition. The fish species and the product's processing history are unknown. This is not generalized to home steaming or to all ankimo.
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ingredient-ankimo —was_observed_with→ (the claim sentence above)Scope: The dish introduction on Ibaraki Prefecture's official website, 「いばらき“冬のお魚”特集2025」 (in translation: "Ibaraki 'Winter Fish' Feature 2025")
Note: A dish process from prefectural public-relations material. No quantity, heating time, or scientific name is given, and this is not a measurement of bitterness or physical properties.
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ingredient-ankimo —is_prepared_by→ (the claim sentence above)Culture (1)
Scope: The 3 dictionaries included in Kotobank: Digital Daijisen, Seisenban Nihon Kokugo Daijiten, and Sekai no Ryori ga Wakaru Jiten.
Note: All 3 dictionaries stop at descriptions such as 「珍重」 (in translation: "prized"); no definition explicitly mentioning bitterness or slight bitterness was found in the material checked.
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ingredient-ankimo —is_defined_in_dictionary_as→ (the claim sentence above)