Onion cut with a dairy knife on a meat board
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Question
An onion was cut with a dairy knife on a meat cutting board. What is the status of the knife and the board?
Answer
If the knife became dairy because it was used with milk in a kli rishon, both the knife and the board are forbidden and require kashering. Even a plastic board can be kashered. In the meantime, one can temporarily use the other side of the board.
Source
Shulchan Aruch Yoreh De'ah, Siman 95, Mishnah Berurah, Siman 452, Se'if Katan 7, Chayei Adam, Klal 56
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