250px|right|thumb|A copper blech covers the lit burners on a stovetop, keeping food warm for the Shabbos meal. A blech (from the Yiddish word בלעך () meaning "tin" or "sheet metal", alternatively from Middle High German or Standard German "Blech", meaning 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, as part of the precautions taken to avoid violating the halachic prohibition against cooking on the Sabbath.
250px|right|thumb|A copper blech covers the lit burners on a stovetop, keeping food warm for the Shabbos meal. A blech (from the Yiddish word בלעך () meaning "tin" or "sheet metal", alternatively from Middle High German or Standard German "Blech", meaning 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, as part of the precautions taken to avoid violating the halachic prohibition against cooking on the Sabbath.
== Common use == Rabbi Fishel Jacobs' The Blech Book—The Complete & Illustrated Guide To Shabbos Hotplates gives the following guidelines: The food (including water) intended for Shabbos use should be completely cooked. The stove's gas flames or electric coils are turned on. The blech is placed over these. Alternatively, the Shabbos 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.
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