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Ingredients
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Broth
Tare & Mentaiko Sauce
Chashu (Braised Pork Belly)
Noodles & Toppings
Method
Broth
- 1
Blanch bones
Place pork bones in a large stock pot and cover with cold water. Bring to a hard boil over high heat and boil for 10 minutes to remove blood and impurities. Turn off heat and carefully drain and discard the blanching water. Rinse the bones and the pot under running water, scrubbing away scum.
- 2
Simmer to emulsify
Return cleaned bones to the pot and add 5,000 ml cold water. Bring to a roaringly vigorous boil, then reduce just enough to maintain a very active simmer (a rolling boil helps emulsify marrow into the liquid). Skim any surface scum for the first 30 minutes. Keep the pot uncovered or partially covered so evaporation helps concentrate the broth. Maintain a strong simmer for 4–6 hours, occasionally stirring and continuing to skim foam and fat. The broth will turn opaque, milky and rich — that is characteristic tonkotsu.
- 3
Add aromatics & finish
After about 2 hours of simmering, add the halved onions, smashed ginger, crushed garlic and white leek to the pot. Continue simmering the full time (4–6 hours total). Taste and season lightly with 2 tsp salt about 30 minutes before finishing. When done, strain the broth through a fine-mesh sieve lined with cheesecloth into a clean pot. Discard solids. Keep the broth hot and skim any excess fat from the surface if desired; reserve some fat for additional richness if you like.
Tare & Mentaiko Sauce
- 4
Make soy tare
Combine 120 ml soy sauce, 60 ml mirin, 60 ml sake and 1 tbsp sugar in a small saucepan. Bring to a gentle simmer and cook for 3–5 minutes to meld flavors. Turn off heat and let cool. Store tare at room temperature or refrigerate until assembly.
- 5
Prepare mentaiko mixture
Gently slice open the mentaiko sacs and scoop the roe into a bowl. Add 30 g unsalted butter (softened), 1 tbsp Japanese mayonnaise, 1 tbsp yuzu or lemon juice, 1 tsp toasted sesame oil and 1 tbsp chili oil. Mash and whisk until smooth to create a creamy, spicy mentaiko paste. Taste and adjust heat with more chili oil if desired. Keep chilled until ready to use.
- 6
Chashu (Braised Pork Belly)
- 7
Prepare pork belly
Roll the pork belly lengthwise into a log and tie tightly with kitchen twine at 2–3 cm intervals to hold shape. Pat dry and sear all sides in a hot skillet until browned for color and extra flavor (about 6–8 minutes total).
- 8
Braise
In a pot large enough to hold the belly, combine 1,000 ml water, 80 ml soy sauce, 60 ml mirin, 60 ml sake, 2 tbsp sugar, 3 crushed garlic cloves, 30 g smashed ginger and 2 scallion whites. Add the seared pork belly, bring to a gentle simmer, then cover partially and braise over very low heat for 1.5–2 hours, turning occasionally, until the pork is fork-tender.
- 9
Cool & slice
Remove the pork from the braising liquid and let it cool in the braising liquid (or refrigerate submerged) to let flavors penetrate and firm the meat — at least 30 minutes (longer is better). When cooled, remove twine and slice thinly (3–5 mm). Reserve some braising liquid; you can skim and use a tablespoon to glaze the sliced chashu when plating.
Noodles & Toppings
- 10
Make ajitama (marinated soft eggs)
Bring a small pot of water to a rolling boil. Lower 4 room-temperature eggs gently and boil for 6 minutes for jammy yolks. Immediately transfer to an ice bath to stop cooking. Peel carefully. Mix 60 ml soy sauce, 30 ml mirin and 60 ml water to make a marinade and submerge the peeled eggs in this mixture for at least 4 hours (or overnight) in the refrigerator. Halve eggs before serving.
- 11
Prep toppings
If using dried kikurage, rehydrate per package instructions, drain and slice into thin strips. Slice green onions finely on the bias. Lightly toast 2 tbsp sesame seeds in a dry skillet until fragrant. Cut nori sheets into halves or quarters for easy garnish.
- 12
Cook noodles
Bring a large pot of water to a vigorous boil. For fresh Hakata-style thin noodles, cook per package directions (typically 45–60 seconds) until al dente — thin noodles cook very quickly. Stir gently to separate. Drain briefly in a colander and shake off excess water. Hot noodles should be transferred immediately to bowls with hot broth to prevent sticking.
Assembly
- 13
Season each bowl
For each of 4 bowls, ladle approximately 350–400 ml of the hot strained tonkotsu broth into a saucepan and bring to just under a simmer. Add 2 tbsp of the prepared soy tare to each bowl (or to the broth in the pan) and stir to dissolve so that each bowl is evenly seasoned. Adjust tare amount to taste — more for saltier, less for milder.
- 14
Add noodles & mentaiko
Place a portion of freshly cooked noodles into each broth bowl. Add about 1 tbsp of mentaiko paste to the center of the noodles (use warmed mentaiko-butter if you prefer it slightly melted). Swirl gently so the mentaiko disperses into the hot broth, creating a spicy, umami ribbon through the soup.
- 15
Top and finish
Arrange 2–3 slices of chashu on each bowl, add half an ajitama, a small handful of sliced kikurage, a sprinkle of sliced green onion, 1/2 tbsp toasted sesame seeds and a sheet/piece of nori on the side. Drizzle about 1/2 tbsp chili oil over each bowl (or to taste) for an additional spicy kick. Serve immediately while piping hot.
- 16
Serving suggestions
Provide extra tare, chili oil and toasted sesame seeds at the table so diners can adjust salt and heat. Leftover broth keeps refrigerated for 2–3 days; chashu can be reheated briefly and sliced when cold for cleaner slices.