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1
Place the pork leg bones in a large pot and cover with cold water. Bring to a full boil and hold for 10 minutes. The water will turn grey and cloudy with blood and impurities. Drain completely and rinse each bone under cold running water. Discard this first liquid entirely. The bones are ready when they are visibly clean and grey-white at the surface.
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2
Return the cleaned bones to the pot with 3 litres of fresh cold water and the bruised ginger. Bring to a vigorous rolling boil over high heat and maintain this boil, uncovered, for 12 to 18 hours, adding water as needed to keep the bones submerged. Do not reduce the heat to a simmer. This step is where the dish lives or dies: it is the sustained, violent agitation of the boil that forces collagen and marrow to emulsify into the liquid, producing the defining milky-white, opaque, unctuous tonkotsu broth. A gentle simmer produces a clear stock — that is a different dish and a failed tonkotsu. The broth is ready when it is creamy, fully opaque, and white as whole milk.
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3
Strain the broth through a coarse sieve, discarding bones and ginger. The yield should be approximately 1.5 litres of dense, ivory-coloured liquid. Taste: the flavour should be intensely porky and round, with a coating mouthfeel from the emulsified collagen. Season by whisking in the shio or light shoyu tare — approximately 15 ml per bowl — adjusting so the pork character remains dominant and the tare is present but not assertive.
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4
Cook the thin straight noodles in a large pot of unsalted boiling water. Hakata noodles are fine and cook rapidly — begin tasting at 60 seconds for kata, longer for futsu or yawara per the diner's stated preference. Remove when the desired texture is reached. The noodle should be straight and firm in the bowl, never bloated or clumping.
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5
Warm four bowls. Ladle approximately 350 ml of hot tonkotsu broth into each. Add the drained noodles. Top each bowl with one slice of chashu, a pinch of sliced negi, a small mound of beni shoga, and a teaspoon of sesame seeds. Toppings are minimal by tradition — the bowl should read clean and focused, with the white broth as its visual and flavour centre. Serve immediately; the noodles absorb broth rapidly.
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6
When the noodles are finished and broth remains in the bowl, kaedama may be called: a fresh portion of noodles, cooked to order, is added directly to the remaining broth in the same bowl. This practice, unique to Hakata ramen, is the correct conclusion to the meal.