Source: https://youtube.com/watch?v=FMrtri7SxHw
Readjusted to make a smaller amount. Original is for 1.5L, this is for 0.5L.
Be sure to start soaking the Kombu a few hours before starting!
- 12g kombu (昆布) strips (two of the long, skinny strips of kombu or 1 of the wide strips) (0.5oz).
- 2 cup water
- 25g katsuobushi/bonito flakes (鰹節)
- Put water and kombu (昆布) strips in a saucepan.
- Cover an let sit for at least 2–3 hours (if possible—it’s probably OK to skip this step). Keep in a refrigerator if leaving for a longer time, such as overnight.
- Uncover and bring to a simmer and simmer for 3 minutes.
- Turn off heat.
- Skim off any gunk.
- Remove kombu (昆布).
- Add katsuobushi (鰹節) and let rest for 2 minutes.
- Strain through a coffee filter or muslin cloth.
You may freeze any leftovers.