Some kosher companies make cereals that are Kosher for
Passover.
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Chametz can be eaten in Jerusalem until the morning before
Passover and cannot be eaten again until the end of the Passover
season. The exact time until when chametz can be eaten is
publicized locally in Jewish communities. Some religious Jews burn
or destroy any chametz they have in preparation for Passover.
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No, bulgar is chametz.
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Chametz (Exodus ch.12) is leavening or leavened goods such as
bread, cakes, and many other products. Torah-observant Jews do not
eat them in Passover.
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Perogie dough is made with raw flour and therefore is chametz.
They cannot be eaten during Passover.