On Shabbat we are prohibited from cooking, baking, frying, grilling, microwaving, warming, etc. Consequently if one wishes to have hot food on Shabbat, the food must be pre-cooked and prepared before the onset of candle lighting time. The pre-cooked food is then placed on the stove, in the oven or the warmer, etc. before candle lighting time. The temperature control settings should be set before candle lighting time and may not be touched throughout the entire Shabbat. The stove top burners should be covered with a ‘blech’ (a metal or foil cover). A new blech should be purchased for Pesach. When pots and pans have been removed from the fire on Shabbat they can only be replaced on the ‘blech’ under the following condition: Either the pot has not been placed down on a surface or even if it has, someone was still holding on to it, and one must have intention of returning it to the Blech. This is only permitted for food that has been cooked completely and still hot. Food that has been removed from the oven, cannot be put back into the oven, under any circumstances.