Tasting

Although tasting food (e.g. to see if it needs seasoning) and then
spitting it out does not constitute vkhft, and we assume that when
one accepts upon himself to fast he obligates himself not to eat,
still, on Yom Kippur and Tisha B’Av the fast does not depend on
his acceptance and tasting is therefore forbidden. One should be
strict in this on other fast days as well. (MB 567)
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Adopted from the shiurim of Ha Rav Leible Sternberg

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