Can I use a drop of rice vinegar on Rosh Hashana in a recipe, if it’s taste will not be detected? It will be mixed in with other sweet foods and the food itself containing the vinegar will be sweet.

It is OK to add some vinegar to a dressing if its taste won’t be detectable.   Sources: שו״ת רבבות אפרים חלק ו’ סימן ש”ח. פסקי תשובות סי' תקפג הע'…

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