Hechsher Keilim Archives | Rosh Yeshiva Responds

25 01, 2026

Kashering Factory-Seasoned Cast Iron Cookware

January 25th, 2026|Bishul, Hechsher Keilim, Kashrut, Orach Chayim, Shulchan Arukh, Yoreh De'ah|

QUESTION

Boston, Massachusetts

Could you please share your approach to kashering a new stovetop griddle? There appear to be three defensible positions about cast iron cookware:

(a) Treating the factory seasoning as b’eyn, requiring libun gamur. This is the position of Rabbi Belsky z”l at the OU. It seems that this is based on the Shakh (YD 121:8) and Pri Megadim about solids absorbed directly (though this does seem to be a minority, machmir view in the books).

(b) Treating it as baluah, so either hagalah or libbun kal suffices. This is the position of Rav Gedaliah Dov Schwartz z”l, seemingly following

2 04, 2023

Managing Environmental Concerns: Glass Dishes and Glass Serving Plates from Goodwill for Pesach

April 2nd, 2023|Hechsher Keilim, Moadim, Orach Chayim, Pesach|

QUESTION

Denver, CO

It seems environmentally wasteful to buy a new set of dishes to be used one week per year. Would it be acceptable to buy glass dishes and glass serving plates from goodwill to use for Pesach?

ANSWER

While I think there are cases where you can assume that glass isn’t boleya/that it is kasherable, we tend to be quite strict around these things over Pesach, and the environmental cost of buying one set of dishes for a one-week-a-year use seems to me to

Switching Pesach China Dishes Not Used for 12 Months from Meat to Dairy

28 03, 2023

Switching Pesach China Dishes Not Used for 12 Months from Meat to Dairy

March 28th, 2023|Hechsher Keilim, Orach Chayim, Pesach|

QUESTION

Jerusalem, IL

A family that uses their (flieshig) grandparent’s Pesach china has gone vegetarian. They would like to turn the china dairy. Obviously, they haven’t been used since last Pesach. Any room for to allow this?

ANSWER

Yes they can. They should kasher through iruy and—when it comes to the tureen and serving dishes and possibly the soup bowls (see below), they should ideally wait 12 months from last fleishig use, which means the Pesach after this. The reason to allow this is:

1. We are only going from fleishig to milkhig, so what is balua (absorbed) is taam heter (permissible flavour) to begin

28 03, 2023

Kashering a Dutch Oven for Pesach Used for Both Cooking and Baking

March 28th, 2023|Hechsher Keilim, Orach Chayim, Pesach|

QUESTION

Chicago, IL

Kashering question—this Dutch Oven is used as a pot, but also upside down to make bread. How should it be kashered for Pesach? Do we follow it’s majority usage (רוב תשמישו) as a pot, and therefore require hagalah? Or do we do libun for the smaller piece since it’s it used for baking but only a lid for bishul?

ANSWER

I have a hard time considering this rov tashmisho. I don’t think that rov tashmisho is measured by 51%. If using it

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