The word kosher means proper or acceptable, and it has informally entered the English language with that meaning. But kosher laws have their origin in the Bible, and are detailed in the Talmud and the other codes of Jewish traditions. They have been applied through the centuries to ever-changing situations, and these rulings, both ancient and modern, govern OU Kosher certification.
Meat and Dairy can't be mixed in any way, shape, or form.
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