If you want to make your own ponzu, check recipe by Namiko from JustOneCookbook here (on my list, after I find real fermented mirin)
Recipe by Veronika Bar, of veronikabar.com. All images and content on this site are copyright protected. Please do not use my images without my permission. If you’d like to share this recipe on your site, please re-write the recipe and link to this post as the original source. Thank you.