Yosef Karo

“ One who inserts a milk spoon into a meat pot, or the opposite, we estimate based on is the total amount of what was inserted from it into the pot (if the spoon is ben yomo, that is, it was used in a vessel that was on the fire within the last 24 hours) . And there is one who says that a metal spoon, we measure based on all of [the spoon] , because when part of it gets warm, it all gets warm. ”

“ It is not appropriate to say [that the onions and vegetables] are inherently, entirely not kosher; they are still entirely kosher, and similarly one only needs to [have 60 times] against that which was absorbed [by the onions and the vegetables] . ”