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MB3 151b: Smoothing and Peeling Foods on Shabbos (321:19)
The sequence of crushing, pounding, and pulverizing: If you did the first step before Shabbos you can do the other two steps. Smoothing (ממחק) the surface of food on Shabbos. Peeling garlic and onions on Shabbos. Peeling eggs or removing skin from chicken on Shabbos. Peeling an apple and eating watermelon on Shabbos.