Tonkotsu Ramen Broth
This is not a light soup. It is heavy, rich, and demands your full attention to ensure the marrow extracts fully without scorching the bottom of the pot. When done right, the broth should be thick enough to leave a film on your lips.
Commit to the boil
You cannot rush the breakdown of marrow. If the boil isn't vigorous, you will end up with clear soup rather than the signature creamy white tonkotsu.
- 12-quart heavy-bottomed stock pot
- fine-mesh strainer
- large spider skimmer
- immersion blender
What goes in.
- 5 lbpork leg or marrow bones, split
- 1 lbpork fatback
- 2yellow onions, halved
- 1 headgarlic, halved crosswise
- 3-inch pieceginger, smashed
The Rolling Boil
You must maintain a violent, rolling boil throughout the process. This mechanical agitation forces the fat particles to collide with the water molecules, creating the opaque, milky suspension.
The method.
Blanch the bones
Place bones in a pot and cover with cold water. Bring to a boil for 10 minutes. Drain and scrub each bone under cold running water to remove all dark bits and coagulated blood.
Initiate the boil
Return cleaned bones to the pot with the fatback and aromatics. Cover with fresh water by two inches. Bring to a rapid, rolling boil.
Skim and maintain
Skim any grey foam that rises to the surface for the first hour. Keep the water level topped off so the bones are always submerged.
Emulsify
After 10 hours, remove the aromatics. Use an immersion blender to break up the softened fatback directly in the broth to encourage emulsification.
Strain
Boil for an additional 2 hours until the broth is stark white. Pass the liquid through a fine-mesh strainer into a clean container, pressing on the marrow to extract every bit of richness.
When it doesn't go to plan.
If your broth turns brownish, the heat was too low or you didn't scrub the bones clean enough during the initial blanch.
Always use a heavy-bottomed pot to prevent the marrow from burning on the base, which ruins the entire batch.
Do not add salt to the broth while boiling; season each bowl individually with your tare when serving.
The ones that keep coming up.
Can I use a pressure cooker?
You can achieve a similar opacity in a fraction of the time, but the depth of flavor from a 12-hour boil is difficult to replicate under pressure.
What if the broth is too thin?
Boil it down further without a lid. If it lacks body, add more pork fatback during the final two hours of boiling.
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