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kashering stove and oven

Question:
Someone said one can kasher a stove by putting on the fires for ten minutes,other say less, is that true? My father zl would blow torch it .

he also said one can use a non-kosher stove or oven if the food is double or triple wrapped. is that true?

thank you for your help

Answer:

Yes, metal stove top grates can be burnt out with the fire of the stove. A blech should be put on the stove and all the fires should be lit for about 10 minutes. This is sufficient for libun kal, see Mishna Brura 451:34 that for a stove top libun kal is enough, as the food doesn’t directly touch the stove top, only the pot.

Food which is double wrapped may be cooked in a non kosher oven. The pan should also not be placed n the non kosher grates, so if the wrapping is not on the bottom as well, the pan should be placed on a piece of tin foil.

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