1. We learned yesterday that the Torah melachah of bishul includes cooking or baking any raw food to be at least one-third cooked (solids) or to the temperature of yad soledet bo (liquids). One may also not continue to cook or bake foods that have already reached the temperature of yad soledet bo to a higher temperature, as this also qualifies as the Torah melachah of bishul. It should be noted that aside from the issue of bishul, most raw foods that are inedible, such as a potato, are muktzeh and may not be moved normally at all (Shulchan Aruch, O.C. 308).

2. One may not cook raw foods that are edible in their raw state, which is prohibited at minimum rabbinically, and according to some, may also qualify as bishul on a biblical level (see Rambam, Shabbat 9:3; Sha’ar Hatziun 318:114). This would include, for example, baking an apple or cooking a pepper on Shabbat by placing it in an oven or on a stove that is already lit.

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Dedicated by Fran Broder as a zechus for everlasting peace in Eretz Yisrael in the merit of learning Hilchos Shabbos.