It says in SA YD Siman 98 Sif 4 that even when you have shishim in a tavshil c’neged the issur (cheilev) you still must add water in order the the cheilev should float to the top and can be removed. If such a shailo happened on Shabbos what should one do to avoid shailos of borer…
(adding the water, taking out the issur, etc.)


If the fat is a separate entity to the liquid, which it presumably is if water can raise it to the top, then there is no problem with adding water: Raising a separate entity within a liquid is not an act of borer.

Taking out the fat will depend on the dispute between the Taz and other poskim (Maharit and others) concerning a mixture of solids and liquids.

According to many poskim, this does not constitute a “mixture,” and there is no problem in taking out the solid from the liquid. The Taz rules that there is a problem of borer, and the Mishnah Berurah mentions his opinon, writing that some of the soup should be taken out with the fly.

The same procedure should be used here.

Best wishes.

Tags: borer

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