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According to Ashkenazi tradition, "If a meat/milk pot hasn't been used for a year+, it may be used as the other type without Kashering". If I have a ceramic coffee mug that may or may not have contained a hot non-kosher food/liquid more than one year ago, may I now use it?

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    where is that quote from? i wasn't aware of any such commonly accepted rule. please edit in where you found it, and what your unsure about. – Double AA Nov 13 '15 at 3:21
  • Although not a direct answer, the following may be a good starting point. Note: I admit to not having read the entire link. The following source quotes Shulchan Aruch (Yoreh De'ah 122,6): nishmat.net/Uploads/files/Keeping_Kosher_Eating_Out.pdf It seems to suggest that a non-kosher pot left unused for at least twenty four hours could be used for kosher if a non-Jew makes the kosher food without being asked to (sorta like not directly asking a non-Jew to perform a task that is forbidden to a Jew on the Sabbath.) The article ultimately concludes that the above allowance is, ...... – JJLL Nov 13 '15 at 3:46
  • ....in a practical sense, impractical, and does not permit such practice. – JJLL Nov 13 '15 at 3:48
  • not familiar with such a rule.would like to see a source which can be applied to practical halacha. If such a thing were to be true my follow up thought would be not likely to work with a ceramic mug. If the rule is that pots and pans work this way it's likely b/c they are able to be kashered which means they can loose the taste they have. A mug couldn't be kashered anyways and so this probably wouldn't work, but that's only based on what you presented and accepting it as fact. I'm not sure this is a legitimate way to kasher anything. – Dude Nov 13 '15 at 4:19
  • @Dude, for ceramic, earthenware, and porcelain keilim, the rule is derived from a gemara in Ta'anit (I don't recall daf or amud) – Noach MiFrankfurt Nov 13 '15 at 13:57
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The רמ"א as understood by the Magen Avraham (509:11) quotes a long-standing tradition not to kasher utensils from fleishig (Meat) to milchig (dairy) or vice-versa, because it will by mistake lead to mix-ups and halachic problems.

There are, however, certain leniencies regarding this Tradition:

  1. The פרי מגדים (Orach Chaim, Eshel Avraham 509:30) says that if a person has an extra set of fleishig silveware that he wants to use for milchig, then he cannot simply switch it over to milchig. Instead, he can treif it up on purpose, and then kasher it and use it for milchig. Some find this suggestion problematic.

  2. The חתם סופר (Shu”t Y.D.110) says that what one can do is kasher the fleishig silverware for פסח, and then use it for milchig during the year and it will avoid issues of confusion that the רמ"א was worried about.

  3. The מהרש"ם (Shu"t Maharsham 2:241) says that if a whole year has passed since the dishes were last used, then one can kasher them from one to the other even לכתחילה. This is based on an idea that is found mainly in the חכם צבי. The halacha is that after 24 hours it is מותר to use a meat pot for dairy on the level of דאורייתא, but the דרבנן disallowed it. The חכם צבי says that this גזירה only applies through 12 months (he bases this on a גמרא regarding סתם יינם, which says that any barrel that was אסור due to having had סתם יינם inside it can be used after 12 months, because whatever טעם that was inside it has disappeared. He says that this proves to us that טעם disappears after 12 months, and the same holds true for the טעם of meat or dairy in כלים as well). The מהרש"ם says that even though we do not rely on the חכם צבי to use dishes after a year as though they have lost their old status, we will rely on him to kasher from milchig to fleishig after a year. Rabbi Sobolofky, Rosh Yeshiva in Yeshiva University, felt that one has the right to follow this מנהג of the מהרש"ם, to wait a year and then kasher לכתחילה.

It comes out from these sources that that since the whole reason for the tradition brought down in the רמ"א was it would cause the mixing up of dairy and meat dishes, so when dealing with a Non-Kosher dishes the פרי מגדים felt you are allowed to Kasher right away.

It must be noted that these rules are only true for dishes that are able to be Kashered. Ceramic (for all intensive purposes) cannot be Kashered.

  • The OP noted the dishes could be used without kashering. You conclude (correctly) saying they still need to be kashered (+ tvila). As such the answer is that there is NO permission to use a meat dish for milk and vice-versa without kashering it first – mbloch Jan 2 '16 at 16:31
  • Please note as well this site encourages the use of English to make it accessible to as many people as possible. See meta.judaism.stackexchange.com/questions/1606/… for details. Many thanks for your contribution and hope we will see more of you ! – mbloch Jan 2 '16 at 16:31
  • Can you cite this rama? (And any of the opinions you reference?) – Double AA Jan 3 '16 at 18:24
  • What's an intensive purpose? – Double AA Jan 3 '16 at 18:26
  • @DoubleAA added some sources. – Tzafnas Paneach Jan 10 '16 at 14:47

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