The Danger of Leftover Onion
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Question
In the Talmud, Tractate Niddah (17), it is explained that a peeled onion left overnight is forbidden due to danger. The question arises: if someone left a whole peeled onion in a pot with water and peas overnight to cook it the next day, is it forbidden?
Answer
If there was salt and spices in the soup, it seems they imparted flavor to the onion, and it is permitted. If the onion was cut, it is considered a mixture of onion and other ingredients and is also permitted. However, if there were no spices and it was whole, it is not considered a mixture, and the onion must be removed. If the soup was cooked, the entire soup is forbidden unless there was sixty times to nullify the taste of the onion.
Source
Yoreh De'ah 116
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