A reader asked me to try to figure out a recipe for a sauce from a favorite restaurant of hers. This is my first attempt, and never having tasted the sauce, I can’t say whether my version is close to the original. But she is right: the sauce is delicious. Adjustments I will make to this recipe would be to make more: using the whole package of tofu, proportionally more miso, and proportionally less apple juice (the sauce was too sweet for my taste). Also, the the mustard and fennel would be more refined had I simmered the ground seeds in the vinegar and apple juice for a minute or two, then let it cool to meld the flavors.