Hakata Tonkotsu Ramen (博多豚骨ラーメン)

// SUPPLY LIST

// OPERATIONS

1. 1 Put the split trotters and the leg bones in a large bowl or a scrubbed sink, cover with cold water by 5 cm and soak for 2 hours in the fridge or a cool room, changing the water twice; it will go pink and cloudy as blood leaves the marrow, and by the third change it should stay almost clear. Do not skip this and do not shorten it — blood left inside the bones sets into grey scum during the boil, turning the finished broth beige and giving it a livery smell that no amount of extra cooking will drive out.
2. 2 Drain the bones into a 10-12 litre heavy-based stainless steel stockpot (thin steel or aluminium will scorch once the boil gets hard), cover with cold water by 8 cm, bring to a boil over high heat and boil hard for 10 minutes, until a grey-brown raft of coagulated protein has risen and clung to everything. Tip the whole lot into the sink, then scrub every bone under cold running water with your fingers and a small brush, digging the dark clotted marrow out of the leg-bone channels until the bones are chalk-pale and squeak under your thumb, and wash the ring of scum out of the pot before the bones go back in — one grey smear left clinging to the pot will tint the whole eight hours.
3. 3 Return the scrubbed bones to the clean pot, add 5 litres cold water so they are covered by about 4 cm, bring to a boil over high heat, then hold a hard rolling boil with the lid ajar for 8 hours, topping up with boiling water from a kettle every 45-60 minutes to keep the level within 3 cm of where it started. By hour three the surface should look like simmering milk rather than clear stock. Never let it fall back to a gentle simmer: the white in tonkotsu is a mechanical emulsion of rendered fat and dissolved collagen beaten together by the violence of the boil, and a quiet stockpot will give you a thin brown broth that no extra hours will ever turn white.
4. 4 While the broth boils, make the chashu. Lay the pork belly slab fat-side down, roll it tightly along its long edge into a cylinder about 8 cm across so the fat finishes on the outside, and tie with butcher's twine at 2 cm intervals — pull it tight enough that no daylight shows down the spiral, or the chilled slices will unravel on the board. Brown it all over in a dry 26-28 cm heavy frying pan over medium-high heat for 8-10 minutes, turning as each face goes deep golden and the pan slicks with its own rendered fat.
5. 5 Transfer the roll to a snug 18-20 cm saucepan or small casserole in which it sits with barely a finger's width to spare, and add 100 ml sake, the 200 ml koikuchi soy sauce, the mirin, the sugar, 4 crushed garlic cloves, 20 g sliced ginger, the whites of 4 spring onions and 500 ml water; the liquid must come two-thirds of the way up the roll, so top up with more water until it does rather than trusting the volumes in a wider pan. Bring to a bare simmer — barely trembling, around 92°C/198°F — cover with a lid or a paper cartouche and cook for 2 hours, turning every 30 minutes, until a skewer slides into the centre with no resistance and the twine sits loose against shrunken meat. Hold the heat down: a real bubble squeezes the belly into stringy, dry fibres.
6. 6 Lift the roll out, cool it for 20 minutes, then wrap tightly in cling film and refrigerate for at least 8 hours or overnight. Warm chashu tears and shreds under the knife; only a fully chilled roll gives the clean 3 mm ovals a Hakata bowl needs. Strain the braising liquid into a jug, chill it, and lift off the set fat cap, keeping the liquid.
7. 7 For the ajitama, lower the fridge-cold eggs on a spoon into a saucepan of water at a steady but not violent boil, cook for exactly 6 minutes 30 seconds, then move them straight into iced water for 5 minutes and peel under a trickle of cold water; a thrashing boil knocks them together and cracks them, and a short chill lets the yolk keep setting in its own heat. Submerge them in 200 ml of the reserved braising liquid let down with 100 ml water, in a small container or a bag with the air pressed out, and refrigerate 4-12 hours — start this in the evening so they come out inside the window on day two, because past 12 hours the whites turn rubbery and aggressively salty.
8. 8 At the 6 hour 30 minute mark, add the 6 whole garlic cloves, the peeled halved onion, the remaining 4 spring onion whites, the remaining 20 g ginger and the 200 g piece of back fat to the boiling broth. Peel the onion rather than leaving the skin on: the skin leaches brown into a broth whose whole point is opacity without colour. Hakata keeps aromatics deliberately faint, so this is a late, light touch rather than a stockpot mirepoix — pile in vegetables at the start and you get pork-flavoured onion soup instead of tonkotsu. At 8 hours total, crush the softened trotter bones and cartilage against the side of the pot with a wooden spoon; they should give like wet chalk, releasing the last of the gelatine.
9. 9 Fish out and reserve the back fat, then strain the broth through a colander into a second pot, pressing hard on the solids, and pass it again through a fine mesh sieve. You should have 2.2-2.5 litres of opaque, coffee-cream-coloured broth that coats a spoon thickly and sets to a firm jelly when cold; if it looks thin, boil it down uncovered to that volume rather than adding anything to thicken it. That is close to twice what four bowls need, which is normal — cool the surplus fast in a shallow tray and refrigerate up to 3 days or freeze it, because tonkotsu left to cool slowly in a deep pot goes sour by morning. Mince the reserved back fat to a coarse paste for spooning over the finished bowls.
10. 10 Make the tare: warm the 150 ml sake in a small pan over medium heat and let it boil for 2 minutes to drive off the alcohol and reduce it to about 120 ml, take it off the heat, then stir in the 8 g fine sea salt and the 60 ml usukuchi soy sauce until every grain has dissolved. Let it cool to about 60°C/140°F — hand-hot, with no steam driving off it — before dropping in the kombu, then cover and steep for at least 1 hour before lifting the kombu out; you will have about 175 ml, enough for four 40 ml bowls with a little spare. Never let kombu sit above about 70°C/158°F: it goes slick and faintly bitter, and a Hakata bowl is far too plain to hide that behind anything.
11. 11 Soak the kikurage in cold water for 30 minutes until they swell into soft springy petals with no hard translucent core left in the middle, trim off the woody nubs and shred them 2 mm thick. Slice the chilled chashu 3 mm thick, allowing 3 slices per bowl, halve the marinated eggs with a wet thin-bladed knife, slice all the spring onion greens into fine rings, and heat 4 deep ramen bowls in a 100°C/212°F oven or by filling them with boiling water. A cold bowl drops tonkotsu below serving temperature within a minute and you will watch the fat set into grey rings on the surface.
12. 12 Bring 3 litres of unsalted water to a furious boil in a wide pot for the noodles — unsalted as in Hakata, so the same water serves every bowl and every kaedama — and in a separate saucepan bring 1.3 litres of the broth to a hard boil and keep it there; tonkotsu is served close to boiling, and the boil re-emulsifies any fat that separated in storage. Empty and dry the bowls, put 40 ml of tare in each, and sear the chashu slices for 30-45 seconds a side in a dry hot frying pan until the edges blister and the fat turns glassy.
13. 13 Shake the loose starch off the noodles, drop 480 g into the furious boil in two batches, stir at once so they do not weld together, and cook about 60 seconds for futsū (normal), 30-40 seconds for katamen, or 15 seconds for the barikata most Fukuoka regulars order — harigane, at barely 10 seconds, sits one grade harder again and eats close to raw. These noodles are low-hydration and go from perfect to sodden in under 15 seconds, so have every garnish on the counter before they hit the water. Drain each portion hard in a noodle basket or sieve, shaking it 4-5 times so no water gets into the bowl and thins the broth.
14. 14 Pour 300 ml of boiling broth into each tare-seasoned bowl and stir once, lower in the noodles and straighten them with chopsticks so they all run in one direction, then top with 3 slices of chashu, half an egg, a mound of kikurage, a small spoonful of the minced back fat, a pinch of spring onion greens, a pinch of sesame seeds and a tangle of beni shoga at the near edge. Serve immediately, with extra beni shoga, sesame and a grater of garlic on the table — the bowl does not rest and does not improve while it waits. Keep the noodle water boiling in case anyone calls kaedama, and drop the reserved 120 g portion straight into their remaining broth. Leftover chashu keeps 4 days in its strained braising liquid and is the whole point of chashu-don the next day.

// CLASSIFICATIONS