Heat Sources
Kli Rishon A kli rishon (כלי ראשון, "first vessel") is a vessel that was heated directly on a flame or other source of heat. Even when removed from the source of heat, this vessel maintains its status as a kli rishon, and possesses the capacity to enact bishul on any type of food placed within it. This capacity remains until the pot and its contents cool below the temperature of yad soledet bo (יד סולדת בו, the degree of heat "from which the hand recoils").
Rabbi Simcha Bunin Cohen, The Shabbos Kitchen Mesorah Publications, Ltd. 1991, page 17The prohibited activity of bishul is separate and distinct from that of havarah (הבערה, "kindling a fire"). Performing bishul with a pre-existing flame is forbidden on Shabbat The prohibition of bishul, however, is not limited to the use of fire as a heat source; it is forbidden to perform bishul with any source of heat,whether it be an actual flame, or an electric stove/range, a hot plate, an urn or a microwave oven. Moreover, placing food into a kli rishon may constitute bishul in certain instances. However using heat from the sun to cook is allowed on shabbat. (talmud shabbat 39a)
Read more about this topic: Sabbath Food Preparation
Famous quotes containing the words heat and/or sources:
“The hotel was once where things coalesced, where you could meet both townspeople and travelers. Not so in a motel. No matter how you build it, the motel remains the haunt of the quick and dirty, where the only locals are Chamber of Commerce boys every fourth Thursday. Who ever heard the returning traveler exclaim over one of the great motels of the world he stayed in? Motels can be big, but never grand.”
—William Least Heat Moon [William Trogdon] (b. 1939)
“The American grips himself, at the very sources of his consciousness, in a grip of care: and then, to so much of the rest of life, is indifferent. Whereas, the European hasn’t got so much care in him, so he cares much more for life and living.”
—D.H. (David Herbert)