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1
Place the split pork femur bones in a large pot. Cover with cold water and bring to a hard boil. Boil for 10 minutes. Drain, then rinse each bone thoroughly under cold running water, removing all grey matter and blood residue. The bones must be clean and pale before the broth begins — residual blood creates off-flavours that cannot be corrected later. Sense: the rinsing water runs clear.
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2
Return the cleaned bones to a large, heavy pot. Add 4 litres of fresh cold water. Bring to a full, aggressive rolling boil over high heat and maintain it — this is where the dish lives or dies. A gentle simmer cannot emulsify the fat and collagen into the broth; only sustained, violent agitation will produce the characteristic opaque, milky white tonkotsu. Boil at full rolling heat for a minimum of 12 hours, adding water as needed to keep the bones submerged. At 12 hours the broth will be visibly white and viscous; 18 hours produces maximum opacity and collagen depth. Sense: the broth is opaque white, not translucent, and coats the back of a spoon.
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3
While the broth boils, prepare the mayu. Blacken the garlic cloves in a dry pan over high heat until deeply charred on all sides. Transfer to a blender, add the sesame oil, and blend to a smooth, near-black paste. Set aside. Sense: the paste is uniformly dark and the aroma is sharp, bitter-roasted, and pungent.
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4
When the broth has reached full opacity and the desired cooking time, strain through a fine-mesh sieve, discarding solids. Season lightly with the tare — light soy sauce or fine salt only. The broth itself carries the primary flavour; the tare is a background note, not a dominant seasoning. Taste: the broth is rich, deeply savoury, and unctuous, but not aggressively salty.
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5
Bring a large separate pot of unsalted water to a rolling boil. Cook the thin straight noodles for 60–90 seconds only — low-hydration Hakata noodles hydrate rapidly. Most customers in Fukuoka order kata (firm); remove at 60 seconds for that result. Drain immediately. Sense: the noodle yields with slight resistance at the centre when pressed between thumb and finger.
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6
Warm the serving bowls. Ladle approximately 300 ml of hot tonkotsu broth into each bowl. Add the drained noodles. Top with a slice of chashu, a halved seasoned soft-boiled egg, and sliced green onions. Add two or three drops of mayu over the surface. Serve takana, sesame seeds, and red pickled ginger tableside for each diner to add to their own bowl. Sense: the broth surface holds a faint slick of fat and the mayu creates dark threads across the white.