- ½ cup soy sauce
- ⅓ cup mirin
- 3-inch square piece of kombu
- ¼ cup bonito flakes (katsuobushi)
- ½ cup plus 2 tablespoons fresh Meyer lemon juice (about 5 lemons in all), divided
- Combine all of the ingredients except for 2 tablespoons of lemon juice in a jar or container.
- Cover the mixture and let it sit at room temperature for 5 to 10 minutes.
- Strain the mixture; discard the kombu and bonito.
- Stir the remaining lemon juice into the sauce.
- Ponzu sauce can be stored in a covered container in the refrigerator.