1. The melachah of bishul also includes heating non-food items to extremely hot temperatures that it changes form. For example, heating a metal surface to the point that it is red hot or heating wax until it melts also constitutes bishul (Rambam, Hilchot Shabbat 9:6; R. Ribiat, “The 39 Melochos,” p.553).

2. The melachah of bishul applies to cooking with many forms of heat or fire, such as cooking a pot of food on top of a fire on the stove or baking a dish inside an oven that contains a burner. Likewise, cooking or baking on an electric stove or in an oven with an electric heating element that gets very hot constitutes bishul.

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