Onion cut with an unknown knife
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Question
An onion that was cut with a knife, and it is unknown which knife was used. What should be done if one wants to cut or eat it now?
Answer
Initially, it should not be cut with a knife that is not pareve, nor should it be eaten with food that is not pareve, as there is a concern it might be of the other type. However, if it was cut or mixed with one of the types, it is not prohibited due to doubt.
Source
Shulchan Aruch, Yoreh De'ah, Siman 96
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