When adding kombu to kirikiri soy sauce (a type of boiled-down soy sauce used in sushi preparation), start with a small amount and remove it before the aroma becomes too strong. The 8–10 grams mentioned here are based on this particular trial and should be adjusted according to the amount of soy sauce and the type of kombu used.
Trial Procedure
- Prepare clean pots and containers.
- Measure the required amount of soy sauce.
- Add 8–10 grams of kombu and check its aroma.
- After heating, let it cool to room temperature, then store it refrigerated.
Points to Adjust
Longer kombu soaking is not always better. Check the aroma, saltiness, and aftertaste. For the next trial, change either the amount of kombu or the soaking time—do not change both at once.
Hygiene Precautions
Use clean utensils and record the quantity made and the start time of storage. Storage duration varies depending on household hygiene and heating conditions; discard if any off-odor or turbidity appears.



