During Passover, it is forbidden to eat chametz. Therefore, it is also not permitted to use the same utensils that were used with chametz, as they have absorbed its flavor into their walls. When used during Passover, these utensils release the chametz flavor into the food, causing the chametz taste to mix with the food. Therefore, in order to use the same utensils from the year during Passover, it is necessary to undergo a process of neutralizing the utensil, commonly referred to as “kosherization.”
Methods to Extract Chametz from Utensils:
There are two common kosherization methods: “hagalah” and “libbun.” Hagalah involves expelling the chametz found in the walls of the utensil through boiling water. Libbun involves burning the utensil until it turns red and sparks.
The general rule to determine which method to use is: “kebolho kach polto,” meaning “as it absorbs, so it releases.” Therefore, utensils that absorbed chametz through liquid should undergo hagalah, while those that absorbed directly from fire should undergo libbun.
There are other kosherization methods depending on their use, such as “irui,” which involves pouring boiling water over the surface of the utensil or another object or place that needs kosherization, and “libbun kal,” a milder form of burning than regular libbun.
Which Materials Can Be Kosherized?
Not all materials can be kosherized. Utensils made of clay or ceramic cannot be kosherized because their absorption is too penetrative and cannot be completely removed. All utensils made of metal, stone, marble, wood, plastic, or Teflon can be kosherized. According to Sephardic custom, glass utensils do not require kosherization, even if they were used with hot chametz. This includes Pyrex items (though some people are stringent in this case). However, they should be thoroughly cleaned before use.
Do All Utensils Need to Be Kosherized?
Utensils that are used habitually with cold items do not need kosherization. However, those used with hot items, even if not directly on the fire, require kosherization.
What Preparation is Needed Before Kosherization?
The utensil must be perfectly cleaned so that no residue or rust remains. If any part of the utensil has rust that cannot be removed, it should be burned, even if you are going to use hagalah. If you are kosherizing both meat and dairy utensils at the same time using hagalah, you should ensure that one set (either meat or dairy) has not been used in the last 24 hours (and preferably, it is best to avoid using utensils for 24 hours before hagalah).
I Have a Very Large Pot. How Do I Perform Hagalah?
Typically, when performing hagalah, the utensils to be kosherized are placed in a pot of boiling water. If the utensil is too large to fit into the pot, you can submerge one half of it at a time, as it is not necessary for the entire utensil to be fully submerged all at once, provided it is done in parts. If you have a large pot that cannot fit into another pot or in similar cases, fill the utensil completely with water, place it over the fire, and bring the water to a boil. Then, take a pre-heated stone or metal and drop it into the utensil, causing the water to overflow.
Is It Possible to Perform Libbun Correctly?
Yes, it is possible, but it is challenging and requires proper technique. For Passover, we usually refrain from performing libbun on utensils that need it. However, if a part of the utensil that requires hagalah has rust that cannot be removed or similar cases, libbun can be performed.
Do Lids and Handles Also Need to Be Kosherized?
Yes, in the same manner as the utensil itself.
When Should Kosherization Be Performed?
Ideally, kosherization should be done before the start of the fifth hour on the eve of Passover, which is before the time when the consumption of chametz is prohibited. If kosherization is needed after this time, additional details and conditions are required to perform it correctly. In such cases, one should consult with a rabbi.
