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Katsuo (bonito flake) dashi in a glass bowl surrounded by bonito flakes

How to Make Katsuo Dashi (Bonito Flakes Soup Stock)

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Katsuobushi, widely known as "bonito flakes", are a unique ingredient made of thin shavings of wood smoked bonito fish and play an important role in Japanese cuisine. The smokey aroma and rich taste add deep flavour and umami to each dish in which they're added. Learn everything you need to know about katsuobushi from its history and how it's made, to how to make your own katsuo dashi like a pro!

Cook Time20 minutes
Total Time20 minutes

Course Homemade Ingredients
Cuisine Japanese
Cook Time: 20 minutes
Total Time: 20 minutes

Course: Homemade Ingredients
Cuisine: Japanese

Ingredients 
 

Ichiban dashi (first stock)

  • 1000 ml water preferably soft water
  • 30 g bonito flakes katsuobushi

Niban dashi (second stock)

  • leftover bonito flakes from "ichiban dashi"
  • 1000 ml water preferably soft water
  • 15 g new bonito flakes katsuobushi

Instructions 

Ichiban (first stock)

  • Heat 1000 ml water in a pan until boiling. Once boiling, turn off the heat.
    Boiled water in a pot
  • Add 30 g bonito flakes and gently push it down with chopsticks until fully submerged. Leave to steep for 1-2 minutes.
    Adding bonito flakes to make dashi
  • Line a sieve with a clean cloth or kitchen paper and place it over a large bowl. Pour the dashi through the sieve to make a clear broth. (Do not squeeze the cloth.)
    Straining katsuo dashi made with bonito flakes

Niban (second stock)

  • Transfer the used katsuobushi back into the pot and add 1000 ml water.
    Used katsuobushi in a pan
  • Bring to a boil and then lower the heat to a simmer.
    Water added to used katsuobushi to make a second batch of katsuo dashi
  • Add 15 g new bonito flakes and allow to simmer for 10 minutes.
    Adding fresh katsuobushi (bonito flakes) to a second batch of katsuo dashi
  • Again, line a sieve with clean cloth or kitchen paper over a large bowl and strain the niban dashi. This time you can squeeze it to ensure you get all the dashi out.
    Straining second batch of katsuodashi using a strainer lined with kitchen paper