Preparation: Cut the napa cabbage into small, bite-sized pieces.
Combine Ingredients: Place the chopped cabbage, shio koji, and shio kombu into a plastic bag. Gently massage the ingredients in the bag until the cabbage softens slightly.
Pickle: Close the bag, place it in a container to prevent leaks, and refrigerate for at least 2 hours to allow the flavors to develop.
Notes
Storage: Keep any leftovers in an airtight container in the refrigerator. They will stay fresh for up to 5 days.
Substitute: You can substitute shio koji with 1 tsp of salt. You can also substitute shio kombu with 1 tsp of dashi powder and 1 tsp of sugar.
Ensure the seasonings are evenly rubbed into the cabbage to enhance flavor absorption.
Add a pinch of salt if you want it saltier or a splash of vinegar for extra tang.