
Start soaking the kombu strip in 1/4 cup of water for 30 min- 1 hour.
Remove the stem of the enoki mushrooms and cut the rest in half as the image indicates.
After soaking kombu for 30min to one hour, take out the kombu strip and slice it thinly (don't discard the soaking water).
Place the kombu soaking water, sliced kombu, soy sauce, mirin and vinegar in a pot over medium heat.
Once it's boiled, add the enoki mushrooms while loosening them by hand.
Cook the enoki mushrooms for a few minutes. When the enoki mushrooms soften, the broth will thicken.
Let it cool down and then put it in an airtight container.