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Question:
My father-in-law is Sephardic. Can I rely on his koshering of utensils, given that according to the Rema, koshering is also determined by the minority of the vessel's use?
Answer
You can rely on his koshering L’chatchila (initially). The Mishna Berurah ruled that after the fact (Bedieved), even the Rema is lenient in this matter. While it is true that the author of Shulchan Aruch HaRav ruled that “after the fact” refers only to after the food has already been cooked, in your specific case, it is considered a complete Bedieved situation, and you may rely on the opinion of Maran (the Shulchan Aruch) initially.
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