The regional table / Hawaii
Ahi Poke
Poke is not a sauce, a bowl or a trend. In Hawaiian it is a piece — the word describes what you do to the fish with a knife, and a dictionary printed in 1865 says so.
Start with the word, because it settles what the dish is. Lorrin Andrews' Dictionary of the Hawaiian Language of 1865, long out of copyright, gives it plainly: "Po-ke, s. A piece; a part; a portion", glossed in Hawaiian as he pauku, he apahu, he apana. The name is the cut. The same dictionary shows the seasonings already attached to raw seafood: under alaalahee, the dark part of the squid, it offers the example sentence "He alaalahee me kahi kukui inamona, the spawn of the squid with kukui nuts as a relish" — inamona, the roasted and crushed kukui nut, used exactly as it is used in poke now. The salt side of the dish comes from Davida Malo's Moolelo Hawaii, in the Bishop Museum's 1903 edition, where Malo writes that "Salt was one of the necessaries and was a condiment used with fish and meat, also as a relish with fresh food", and describes how it was made: women carried sea water in calabashes or led it along ditches into natural hollows and shallow ponds on the coast, where evaporation made a strong brine, and then moved it to a second shallow vat where it crystallised. Malo lists the essentials of a meal as four things — vegetables, animal food, salt and water — and his translator notes that the word for the animal food, i'a, means primarily fish, and that in times of want salt itself could be called the i'a of a meal. Fish, salt, limu and inamona are all in the nineteenth-century record. The soy sauce and sesame oil that most people now mean by poke are a later overlay from Hawaii's Japanese and Chinese kitchens, and I could not date their arrival from anything I opened, so this page gives the older dressing first and the newer one as an option.
The fish is a modern industrial product even when the dish is not, and Hawaii Sea Grant — the lane this page was planned around — is good on it. Its article on the state's tuna market, by Heather Dudock, sets out the scale: a Honolulu-based longline fleet of about 140 vessels, landing premium fish worth around $125 million a year, producing 95 percent of United States bigeye tuna landings and between 50 and 60 percent of the yellowfin, while accounting for only about 2 percent of the global tuna catch; roughly a fifth of the annual catch leaves for the mainland. It also notes that seafood consumption across the state runs two to three times higher than in any other, and traces the fishery to immigrant Japanese fishermen established in the islands by 1900, their sampans motorised from about 1905, the fleet impounded during the war, the industry labelled dying by the Department of the Interior in the early 1960s and bottoming out in 1975 before the Magnuson-Stevens Act of 1976. The detail that matters most to a cook is the quality check at the Honolulu Fish Auction, which the article says has been run by the United Fishing Agency since 1952 and is the only daily fish auction in the country, selling individual fish on the Japanese model: an employee cuts a little flesh from the tail of each tuna, feels the texture and smells it. That smell is the whole of this dish's food safety, and federal regulation names the reason — 21 CFR 123.3(m) defines scombroid toxin-forming species as "tuna, bluefish, mahi mahi, and other species ... in which significant levels of histamine may be produced in the fish flesh by decarboxylation of free histidine as a result of exposure of the fish after capture to temperatures that permit the growth of mesophilic bacteria". Worth knowing too: the words sashimi and sushi grade mean nothing in law. A search of the entire Code of Federal Regulations returns no occurrence of sashimi at all. Nobody cooks for this site and the quantities below were worked out for this page.
Why this version works
The cut is the dish, and the dish is named after it. Andrews gives poke as a piece, a part, a portion. That is the technique: even cubes of about three-quarters of an inch, cut with a sharp knife straight down through cold fish, with flat faces and square corners. The size is not arbitrary — a cube that small takes dressing on every face in the minute or two it sits, and one that big still eats as fish rather than as a paste. Keep the loin cold and firm while you work, cut across the grain, and never use a food processor or a blunt knife, both of which crush the muscle and release the liquid you are trying to keep inside it.
Histamine is the real hazard and nothing you do at home can remove it. The federal definition at 21 CFR 123.3(m) is worth reading as a shopping instruction rather than as regulation. Tuna is a scombroid species, which means that if the fish was allowed to get warm between the hook and the ice, bacteria convert its free histidine into histamine — and histamine is heat-stable and cold-stable, so neither cooking nor freezing undoes it. The consequence is simple and uncomfortable: the safety of raw tuna is decided before you buy it, by people you will never meet, which is what the tail-cut and the sniff at the Honolulu auction are for. Buy from a counter that turns tuna over fast, buy it cold and ask when it landed, keep it on ice on the way home, and eat it the same day.
Salt is the original dressing, and the fish gives you almost none of its own. Raw yellowfin carries 45 milligrams of sodium per hundred grams, which is nothing, so every bit of seasoning is yours to add. Malo lists salt among the four essentials of a meal and describes it as the condiment used with fish, and coarse paakai is still the right form — large grains dissolve slowly, so the surface of each cube is seasoned while the centre stays clean-tasting, and you can taste as you go. Fine salt dissolves instantly and over-seasons before you have noticed. Salt also draws water out of the fish, which is why poke is dressed shortly before eating and not hours ahead.
Yellowfin is almost fat-free, so the dressing is doing all the work and can easily do too much. USDA puts raw yellowfin at 0.49 grams of fat per hundred grams against 74 grams of water and 24.4 of protein — one of the leanest animal foods there is, and a tenth the fat of raw bluefin at 4.9 grams. Nothing in the fish buffers what you add to it. That is why traditional poke is dressed with salt, a sea vegetable and a crushed oily nut rather than with a sauce: the inamona supplies the fat the fish has not got, in small quantity, without covering it. It is also why a heavy hand with sesame oil or soy turns the dish into dressing with fish in it. Add less than you think, taste, and add again.