Despite stam keilim being eino Ben yomo, why are we not required to use kashered cookwear when dining out? Similarly, if I rent an airbnb that comes with cookwear, do I have to kasher the cookwear before using it?
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The people making the food should use kashered cookware. You’re not making the food.
Your concern is if there is a flavor left over from non-kosher food. Stam Keilim Ainum Benei Yomam says that the flavor is not there.
Can I extrapolate from this that if I stay with someone who doesn’t keep kosher, as long as I don’t help with any actual cooking, I don’t have to kasher the keilim?
yes