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A ''blech'' (from the German by way of Yiddish word for tin or sheet metal) is a metal sheet used by many observant Jews to cover stovetop burners (and for some, the cooker's knobs and dials) on Shabbat (the Jewish Sabbath), as part of the precautions taken to avoid violating the halachic prohibition against cooking on the Sabbath. == Common use == Rabbi Fishel Jacobs's ''The Blech Book—The Complete & Illustrated Guide To Shabbos Hotplates''〔(Blech Book," on Amazon.com ) Retrieved 22-March-2015〕 gives the following guidelines:- * The food (including water) intended for Shabbat use should be completely cooked. * The stove’s gas flames or electric coils are turned on. The ''blech'' is placed over these. Alternatively, the Shabbat hot plate, which needs no ''blech'' (when it is the type which has no knobs to adjust the heat level) is plugged in. * The pot is placed on the ''blech''. It is permissible to place another pot on this one. * The pot on the ''blech'', or another pot which has been placed on it, may be covered with a blanket, clothing, towel, cloth, etc., to keep the heat from dissipating. One side of the pot should be left partially uncovered. During Shabbos, the pots are removed according to need. After removal, it is permissible to return the pot onto the ''blech'', following these guidelines: * The pot should be removed from the ''blech'' with the intention to replace it afterwards and held at all times, not leaned onto any surface. (A heavy or unwieldy pot may be partially leaned on a surface, while being held, if there is no alternative.) * The food must be in the same pot, completely cooked, and has retained at least some of its original heat. The permissibility of ''blech'' (and unblech, below) and the acceptable manner of their use is questioned by several modern kashrut organizations;〔See, for example, (''Warming Food on Shabbos'' by Rabbi David Cohen ), stating in part, "Even if food is fully cooked, hot, and not wrapped, ''Chazal'' legislated that it may not be put into the fire or onto a ''blech''." But see (Ovadia Yosef, ''Yehave Daat'', Vol 2, #45 ); and Pinchas Toledano, ''Fountain of Blessings'', Vol. 2, p. 67.〕 however, the use of a ''blech'' to reheat food on the Sabbath remains very popular among observant Jews. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blech」の詳細全文を読む スポンサード リンク
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