Absorption in Cutting a Sharp Item
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Question
An onion was cut with a pareve knife on a meat plate that hasn't been used for a day. Did the knife and the onion become meaty?
Answer
For a sharp item, one must be stringent even if it hasn't been used for a day (according to Ashkenazi custom, this is by law, and according to Sephardi custom, this is when there is no significant loss). However, since the plate is usually not a primary vessel, it does not render the onion and knife meaty. However, if it is known that it was used in a primary vessel, such as heating food in a microwave, or if it was placed in a meaty primary vessel, then it becomes meaty from the primary vessel, and the onion is forbidden to eat, and the knife requires koshering.
Source
Shulchan Aruch, Yoreh De'ah, Siman 96, Se'if 1, Shach, there, Se'if Katan 6
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