Shulchan Arukh Yoreh De'ah · Siman 93

English

Prohibition of Cooking Milk in a Pot Used for Meat One should not cook milk in a pot that has been used for cooking meat; if this is done within twenty-four hours, the second food is forbidden if it has the flavor of the previous one. G LOSS : The required quantity is evaluated based on the entire pot. But if there was an interval of twenty-four hours between one cooking and the other, the communicated flavor is altered; therefore, the food is permitted, but the pot can no longer be used for cooking either meat or milk. G LOSS : However, it can be used to cook other foods. The pot lid is treated the same as the pot itself. Some are more stringent and equate cooking after the interval to cooking before the interval. This is the custom in some countries, and I myself am accustomed to act this way, following the established custom. But this is merely an act of supererogation, without a legal basis. Therefore, when other circumstances favor the case, or when the foods are intended for the Sabbath meal, or in case of great loss, it is declared permitted if the lid was used only after the interval, as is the case with the pot itself. When one covers a dairy vessel with the hot lid of a meat vessel, if both are hot and both contain foods, both are forbidden; the same applies when the lid is cold and the vessel hot if the vessel emits steam, because the lower one prevails; but the reverse, everything is permitted, only the foods must be scraped if possible; otherwise, everything is permitted. If the pot does not contain foods, everything is permitted, as this case is comparable to two pots touching.