Tonkotsu Broth (Pork Bone Ramen)

Ingredients

• 1.5 kg pork trotters (feet), split by the butcher
• 1 kg pork neck bones
• 500 g pork knuckles
• 4 litres cold water, plus additional to maintain volume
• Optional — for additional body (added at 8 hours)
• 500 g chicken carcasses or chicken feet

Method

1. 1
   Place the trotters, neck bones, and knuckles in a large stockpot. Cover with cold water. Bring to a full boil over high heat and blanch at a rolling boil for 10 minutes. Drain immediately. Rinse every bone under cold running water, scrubbing away any dark proteins, blood clots, and foam residue. The bones are ready when the water running off them is clear.
2. 2
   Return the cleaned bones to the stockpot. Add 4 litres of fresh cold water — the ratio is approximately 3 kg bones to 4 litres water. Bring to a full, rolling boil over high heat.
3. 3
   Maintain at a vigorous, rolling boil — not a gentle simmer — for the entire duration of cooking. This is where the dish lives or dies: only the turbulence of a sustained rolling boil physically emulsifies the bone marrow fat into the water, producing tonkotsu's defining cream-white opacity and mouthcoating richness. A simmer will produce a pale, clear stock. Add boiling water as needed throughout cooking to maintain the original volume.
4. 4
   At the 8-hour mark, add chicken carcasses or chicken feet if using. These contribute additional gelatin — neutral in flavour — without altering the pork-forward character of the broth.
5. 5
   At 10–12 hours, monitor the colour at close intervals. At 6 hours the broth will be pale gold and slightly cloudy. At 10 hours it will be distinctly opaque and beginning to whiten. The target is reached at 12 hours: cream-white, fully opaque — the light cannot penetrate the emulsified fat. Once this colour is achieved, hold at the vigorous boil for a further 2 hours to concentrate.
6. 6
   Test the consistency: take a spoonful and allow the broth to fall back into the pot. Correctly finished tonkotsu falls in a slow, slightly viscous stream rather than a clean water-flow — the consistency of very light cream. Taste the unseasoned broth: it should be deeply porky, with a thin film of gelatin coating the mouth and a slight fatty richness at the lips. Season with tare at the bowl, not in the pot.
7. 7
   Strain through a fine-mesh strainer, pressing gently on the bones. Discard the spent bones. The finished broth is ready to serve immediately with tare and noodles, or to cool and portion for freezing.