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1
Blanch the pork bones in rapidly boiling water for 10 minutes. Drain and rinse each bone under cold running water, removing all grey matter and blood. This initial purge is the foundation of a clean-tasting broth. The bones are ready when the rinse water runs clear.
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2
Place the cleaned bones in a large stockpot and cover with 3 litres of cold water. Bring to a vigorous rolling boil over high heat and maintain that rolling boil — not a gentle simmer — for a minimum of 6 hours, and up to 12 hours for maximum body, adding water as needed to keep the bones submerged. This is where the dish lives or dies: the aggressive boil is the mechanism of emulsification, driving collagen and fat into suspension and producing the characteristic opaque, creamy white colour; a gentle simmer will yield a pale, thin, clear stock that is not tonkotsu.
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3
Skim the broth at intervals — not continuously — removing excess surface fat at set points rather than throughout, as some fat is required for flavour and body. The broth is ready when it is deeply opaque and milky white, coating the back of a spoon with a creamy, silk-like body.
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4
Prepare the chashu. Combine soy sauce, mirin, and sugar in a small saucepan and bring to a simmer to dissolve. Sear the rolled, tied pork belly in a hot pan until deeply browned on all sides, then braise in the soy mixture with enough water to half-submerge for 90 minutes at a low simmer, turning occasionally. The belly is done when a skewer meets no resistance at the centre. Cool in its braising liquid, then slice into rounds 5 mm thick.
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5
Prepare the tare by combining soy sauce, mirin, and salt; heat gently until the salt dissolves. Reserve. This concentrate will season each bowl individually at service — tonkotsu's richness demands assertive seasoning and the tare must be added with conviction.
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6
At service, bring a large pot of unsalted water to a rapid boil. Warm the bowls. Add 20–25 ml of tare to the base of each warm bowl, then ladle approximately 350 ml of hot tonkotsu broth over it and stir to incorporate. Taste: the seasoned broth should be full, saline, and round — not flat.
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7
Drop the Hakata noodles into the boiling water. At 1.5 mm, they cook in 30–60 seconds. Remove at the texture called for — katame (firm) is the Hakata standard — and transfer immediately to the seasoned broth. The noodles are done when they offer a firm, clean bite with no raw flour taste at the centre; any further time in the water is overcooking.
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8
Top each bowl with two slices of chashu, a mound of sliced negi, a pinch of toasted sesame, and a tangle of beni shōga placed to one side. The beni shōga is not garnish — its acid sharpness resets the palate against the fat of the broth and must be present at the table. Serve immediately. When the noodles are finished, the kaedama portion of reserved noodles is cooked for 30–60 seconds and delivered to the diner's remaining broth on request.