How Tonkotsu is Made: Three Days to Make Tokyo's Best Hakata Ramen

Ingredients

• 5 lb Pork Skull Bones (crushed, cleaned of meat and cartilage)
• 1 lb Pork Back Fat (cut into 1‑inch cubes)
• 12 cups Water (cold tap water)
• 4 cups Yobi‑Moshi (previous day’s broth) (reserved from Day 1, acts as starter culture)
• 2 tbsp Salt (adjust to taste at the end)
• 1 piece Kombu (optional, adds subtle umami)
• 4 cloves Garlic Cloves (smashed)
• 2 inches Ginger (sliced thinly)
• 2 tbsp Soy Sauce (for finishing the broth)
• 1 piece Egg (beaten, used for clarification)
• 4 oz Thinly Sliced Pork Meat (preferably lean pork shoulder, cut into thin strips)
• 200 g Ramen Noodles (Hakata style) (thin, firm noodles)
• 4 oz Chashu Pork Belly Slice (tender, pre‑cooked)
• 1 tbsp Pickled Ginger (for garnish)
• 1 sheet Premium Seaweed Sheet (cut into strips for garnish)

Instructions

1. Prepare and Crush the Bones

   Rinse the pork skull bones under cold water, soak for 10 minutes to remove blood, then pat dry. Using kitchen shears or a cleaver, crush the bones into smaller fragments to increase surface area.

   Time: PT30M

2. Initial Boil and Scum Removal

   Place the crushed skull bones in the large stockpot, add 12 cups cold water, and bring to a near‑boil (≈100°C). Once boiling, reduce to a gentle simmer and skim off all foam and scum continuously for 2 hours.

   Time: PT2H

   Temperature: 100°C

3. Replace Water and Add Back Fat

   Drain the used water, rinse the pot quickly, then refill with fresh cold water. Add the cubed pork back fat and return to a boil, then simmer for another 2 hours, stirring occasionally to break down the fat.

   Time: PT2H

   Temperature: 100°C

4. Form Bone Mound and Create Central Hole

   Gather the crushed bones into a mound at the center of the pot. Continue simmering for 1 hour; the concentrated heat will form a small “hole” in the broth surface. Aim for a hole roughly the size of a soft bowl (≈5 cm diameter).

   Time: PT1H

   Temperature: 100°C

5. Day 2 – Yobi‑Moshi Fermentation

   Allow the broth to cool to about 30°C, then stir in 4 cups of reserved yobi‑moshi (previous day’s broth). Cover the pot loosely and let sit at room temperature for 12 hours to develop the characteristic fermented aroma.

   Time: PT12H

6. Reheat and Simmer with Aromatics

   After fermentation, bring the broth back to a rolling boil, skim any new scum, then add kombu, smashed garlic, and sliced ginger. Reduce to a gentle simmer for 3 hours, allowing flavors to meld.

   Time: PT3H

   Temperature: 100°C

7. Egg‑Meat Clarification (Clear Tonkotsu)

   In a separate bowl, whisk the egg together with the thinly sliced pork meat. Temper the mixture by slowly adding 1 cup of hot broth while whisking, then gently pour the tempered mixture back into the pot while stirring continuously. Simmer for 15 minutes at ~80°C.

   Time: PT15M

   Temperature: 80°C

8. Strain the Broth

   Remove the pot from heat and pass the broth through a fine mesh strainer into a clean container, pressing the solids lightly to extract remaining liquid. Discard solids.

   Time: PT15M

9. Assemble the Ramen Bowl

   Reheat the clarified broth to 80°C. Cook the ramen noodles according to package instructions, drain, and place in serving bowls. Ladle hot broth over noodles, top with chashu slice, a soft‑boiled egg, seaweed strips, pickled ginger, and a drizzle of soy sauce.

   Time: PT5M

   Temperature: 80°C

Nutrition Facts

Calories

250

Protein

12 g

Carbohydrates

45 g

Fat

5 g

Fiber

2 g

Ingredient Substitutions

• Instead of Pork Skull Bones: Pork neck bones, Pork femur bones
• Instead of Pork Back Fat: Pork belly fat
• Instead of Salt: soy sauce (will add flavor)
• Instead of Garlic Cloves: garlic powder
• Instead of Ginger: ground ginger
• Instead of Soy Sauce: tamari
• Instead of Thinly Sliced Pork Meat: ground pork
• Instead of Ramen Noodles (Hakata style): any thin ramen noodles
• Instead of Chashu Pork Belly Slice: braised pork shoulder
• Instead of Pickled Ginger: fresh ginger, thinly sliced
• Instead of Premium Seaweed Sheet: regular nori

Equipment Needed

• Large Stockpot (5 L or larger)
• Fine Mesh Strainer
• Ladle
• Kitchen Shears (optional)
• Cutting Board (optional)
• Chef’s Knife (optional)
• Instant‑Read Thermometer (optional)
• Whisk (optional)

Critical Steps — Do Not Skip

• Skimming scum during the initial boil
• Forming the bone mound to create a central heat zone
• Monitoring the size of the surface hole
• Adding yobi‑moshi for fermentation
• Egg‑meat emulsion clarification for a clear broth

Chef Tips from the Video

• Start with cold water to extract maximum flavor from the bones
• Never let the broth boil violently after adding back fat – a gentle simmer prevents scorching
• The size of the surface hole is a traditional visual cue; practice by eye before relying on it
• If you lack pork skulls, a mix of pork neck and femur bones works well but may produce a milder aroma

Troubleshooting

Storage

Refrigerator: Store broth in airtight containers for up to 3 days

Freezer: Freeze in portion‑size bags for up to 1 month

Room temperature: Do not store at room temperature; broth is perishable

Make-Ahead Tips

• The broth can be made up to 3 days ahead; cool quickly and refrigerate
• Portion the broth into freezer‑safe containers for later use
• Reheat gently over low heat to avoid cloudiness

Frequently Asked Questions