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Why the world's best known brands choose the OU for Kosher certification

Kosher for Consumers

Useful articles and interesting information about Keeping Kosher and Kosher Supervision.

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    Category: Behind the Scenes (Theoretical Kashruth)

  • Yoshon

    Rabbi Eli Gersten

    A brief summary of the laws of Yoshon and Chadash.

  • The Kosher Status of Papain

    Gavriel Price

    In the early twentieth century, Belgian colonists in the Congo noticed that the Congolese were careful to store elephant meat in papaya leaves. Intrigued, they found that the papaya leaves, besides protecting the meat, tenderized it. Laboratory analysis demonstrated that a particular enzyme, called papain, was the agent of the process.

  • Recipe for Success: The Making of an OU Restaurant

    Bayla Sheva Brenner

    Kosher dining definitely ain’t what it used to be. “Will it be French, prime rib or sushi tonight?” is not a question kosher diners would have ever imagined asking before the last quarter of the twentieth century. Yet, it looks like the growing attraction to the more exotic kosher fare has joined the classic craving for pastrami on rye with a side of pickles.

  • Baker’s Cheese: On the Crossroads Between Acid Cheese and Rennet Cheese

    Rabbi Eli Gersten

    A discussion of the Kosher status and rules of Baker's Cheese.

  • The Fascinating Story of Kosher Gelatin, or How a Product from Beef Can Be Used in Dairy Delicacies

    Rabbi Eli Gersten

    An explanation of how pareve gelatin can be manufactured from beef and therefore be used in dairy products.

  • Is Sake Kosher?

    Rabbi Gavriel Price

    A discussion of the rules of Kosher sake.

  • The Tasty Muffin: Starting off Your Day the OU Way

    Rabbi Yisroel Bendelstein

    A discussion of the Kosher certification of muffins.

  • Rav Moshe Zt’l’s Heter of Cholov Stam Revisited

    Rabbi Avrohom Gordimer

    Halacha states that milk which is produced without hashgacha (r'iyah of a Yisroel) is non-kosher; such milk is termed "cholov akum". This rule is a gezeirah, lest milk from non-kosher animals be mixed into what otherwise could be assumed to be kosher milk. Milk is only permissible when a Yisroel watches the milking, verifying that milk from non-kosher animal species is not incorporated. (Yoreh Deah 115:1, from Maseches Avodah Zarah daf 35b)

  • Mesorah Fish

    On Sunday February 19th, the Orthodox Union presented a conference on awide variety of subjects pertaining to Mesorah of various “pareve” subjects. The following is a look at the topic I presented, “An Analysis of Kaskeses – Part and Present”.

  • An Analysis of Kaskeses – Part and Present

    Rabbi Chaim Goldberg

    To summarize, fish that have a kaskeses are kosher. The definition of kaskeses is unique to kashrus, and scientific classifications of scales are not halachikly determinative.

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