Doubts About Gevinas Akum

Q. I bought two packages of cheese, which I thought were kosher. Subsequently I discovered that only one was kosher, and the other was not. I took a slice of cheese from one of the containers and used it to make a pizza. I do not remember which package I took the cheese from. Can I eat the pizza? Or must I throw out the pizza and kasher the oven?

A. One would assume that it would be permissible to eat the pizza, since gevinas Akum (non-kosher cheese) is Rabbinically prohibited and the principle of “safek d’rabbanan l’kula” (we are lenient regarding doubts that involve a rabbinic prohibition) should apply. The halacha should be that since the status of the cheese on the pizza is unknown, it should be permitted to be eaten. However, the Shach (Klalei Sfek Sfeika) writes that gevinas Akum is an exception to the rule of safek d’rabbanan l’kula for the following reason. Before the decree of gevinas akum was instituted, non-Jewish cheese was permissible because it was not certain that the coagulant was rennet, and even if it were, rennet is used in very small quantities which are botel on a Biblical level. When the Rabbis decreed that gevinas akum was prohibited, they treated the cheese as if it were certain that rennet was used above the bitul threshold. Once the Rabbinic prohibition was enacted, we can no longer view the cheese as a safek d’rabanan. The pizza should be discarded, and oven must be kashered.

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The Gerald & Karin Feldhamer OU Kosher Halacha Yomis is dedicated to the memory of Rav Yisroel Belsky, zt"l, who served as halachic consultant for OU Kosher for more than 28 years; many of the responses in Halacha Yomis are based on the rulings of Rabbi Belsky. Subscribe to the Halacha Yomis daily email here.