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InJewish law, Hagalah is a procedure performed in order to make fit for use cookware, bakeware, and utensils that were previously used with non-kosher foods in a way that caused the absorption of non-kosher flavors into the walls of the utensil.[1][2]
Hagalah is also done in order to use utensils for dairy cooking after meat was cooked in them, and vice versa, or for using utensils during the Passover holiday after they were previously used with chametz (leavened products). Generally, the kashering is done in the same way that the non-kosher substance was absorbed into the walls of the utensil ("just as it absorbed, so it expels").[1]
This concept is derived from a verse in Parshat Matot that states:
Only the gold, the silver, the copper, the iron, the tin, and the lead; whatever is used in fire you shall pass through fire and then it will be clean; it must, however, [also] be cleansed with sprinkling water, and whatever is not used in fire you shall pass through water.
Utensils made from any type of metal, stone, wood, bone, leather, or natural rubber may be kashered by hagalah. Earthenware, china, porcelain, glassware, and paper utensils cannot be kashered by hagalah. Any utensil which may get ruined during the hagalah process may not be kashered, out of concern that its owner would not want to properly kosher the utensil in order to avoid damaging it.[2]
Before immersion in the boiling water, the object must be cleaned thoroughly and left unused for a period of 24 hours. All surfaces of the item are then placed into a pot of water that is on the heat source and at a rolling boil.[3]
The Sages explained that when one cooks a non-kosher food in a pot, its taste is absorbed in the walls, and if one later cooks a kosher food in the same pot, the non-kosher taste will be released from the walls of the pot and enter the kosher food, rendering it forbidden. To remove the taste absorbed in the walls, the pot must be kashered in the same way that it absorbed the taste.
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