How can I susbtitute unseasoned rice vinegar for seasoned? I have unseasoned rice vinegar but a recipe that calls for seasoned.  I assume I should add sugar and salt to substitute for seasoned vinegar, but in what proportions would mimic a typical seasoned rice vinegar?
For each cup of vinegar, add 3 tablespoons of sugar and one tablespoon of salt. You may also add a piece of kelp or a pinch of kelp powder. And of course, all of these proportions can be adjusted to taste.