Before you cook
Background Recipe story & origin
Tonkotsu ramen originated in Fukuoka, Kyushu, in 1937 when a cook at Nankin Senryo accidentally let his pork bones boil too long, creating a milky white broth. Rather than discarding it, he served it-and customers loved it. The Hakata district of Fukuoka became the epicenter of tonkotsu style. The broth requires 12-24 hours of hard boiling, which extracts collagen and fat, emulsifying into a creamy, opaque soup. Thin, straight noodles are traditional, ordered by firmness (kata, bari-kata, harigane). Toppings include chashu (braised pork belly), soft-boiled egg, kikurage (wood ear mushrooms), pickled ginger, and sesame seeds. The 'kaedama' system-ordering extra noodles for your remaining broth-originated here. Hakata ramen shops spread throughout Japan in the 1980s-90s, and the style became internationally popular through chains like Ippudo (founded 1985) and the global ramen boom of the 2000s-2010s.
Before you start Equipment you'll need
- large stockpot — Provides large capacity for simmering pork bones for many hours to extract collagen and create creamy broth
- fine mesh strainer — Strains finished broth through fine mesh to remove all solids and create smooth creamy tonkotsu broth
Safety Safety & allergen notes
- Broth simmers for many hours; check water level periodically.
- Pork bones create foam; skim regularly for cleaner broth.
- Soft-boiled eggs are delicate; handle gently when peeling.
Non-negotiables Rules for success
-
Blanch bones before making broth.
Blanching removes impurities that would make broth murky and off-tasting
-
Maintain a rolling boil, not a simmer.
High heat emulsifies the fat and collagen, creating the signature creamy white broth
-
Cook broth at least 10 hours.
Time extracts collagen from bones; shorter cooking produces thin, weak broth
-
Serve immediately after assembling.
Noodles absorb broth and become soggy; ramen waits for no one
Prep Get set first
About 15 min of prep
- Blanch and clean pork bones
- Prepare aromatics
- Have large stockpot ready
- Plan for 10-12 hours of simmering time
- Prepare toppings during final hours
Tonkotsu broth takes time - 10 to 12 hours minimum. Start the day before or early morning for dinner.
Ingredients
Instructions
Unlock Grouped Step Actions
Plus members get tap-to-check action steps and live ingredient swaps for this recipe.
-
Blanch the bones
Place pork bones in large stockpot, cover with cold water. Bring to a boil and cook 15 minutes. Drain, rinse bones under cold water, scrubbing off any scum. Clean the pot.
-
Build and simmer broth
Return cleaned bones to pot. Add fatback, garlic, ginger, and scallion whites. Cover with water by 2 inches. Bring to a rolling boil. Maintain aggressive boil (not simmer) for 10 to 12 hours, adding water as needed to keep bones covered. Broth should turn milky white.
-
Make the chashu and marinated eggs
Roll and tie pork belly. Combine soy sauce, mirin, sake, and sugar in a pot. Add pork belly, bring to simmer, cover and braise 2 hours until tender. Let cool in liquid. Soft-boil eggs 6.5 minutes, ice bath, peel. Marinate eggs in chashu liquid at least 2 hours.
-
Finish the broth
Strain broth through fine mesh strainer, pressing solids. Season with salt and 1 tablespoon soy sauce per bowl if desired. Slice chashu. Cook noodles according to package. Divide noodles among bowls, ladle hot broth over. Top with sliced chashu, halved egg, scallions, nori, and a drizzle of sesame oil. Serve immediately.
Chef's notes
Tonkotsu means 'pork bone' in Japanese.
Hakata (Fukuoka) is the birthplace of this style.
The broth should be opaque white and coat a spoon.
Thin, straight noodles are traditional for tonkotsu.