Bishul Yisrael

Bishul Yisrael is a Hebrew term, for  one of the laws of kashrut (kosher food) in Orthodox Judaism. The rule prohibits eating certain foods if they are cooked entirely by non-Jews. The term bishul Yisrael (literally "cooking of Israel" - i.e., by a Jew, not connected with the modern State of Israel) is the opposite of bishul akum, (cooking of a non-Jew), which the rule forbids. ("Akum" (עכו"ם) is an acronym of "Ovdey Kochavim U'Mazalot" (עובדי כוכבים ומזלות), literally "worshippers of stars and zodiac signs", but is actually a term for believers in non-Jewish faiths).

This rule is part of a set of decrees instituted by the rabbis of the Talmud to prevent intermarriages with non-Jews. The purpose of the rule is explicitly to inhibit socializing with non-Jews, The prohibition of bishul akum applies to a formal meal prepared exclusively by non-Jews, even if the situation was one which had no other kosher food problems.

The prohibition applies only if the food is prepared exclusively by non-Jews. A small amount of Jewish participation can suffice to keep the food kosher. Different rabbis have different views on the absolute minimum: Sephardi poskim hold that the minimum participation is to light the fire and place the pot on it to cook, while Ashkenazim are satisfied with merely lighting the fire, or even making a slight adjustment to a fire which was already lit by a non-Jew.

The law applies only to foods which, according to the Talmud, are "fit for a king's table". Foods which would not be served at a state dinner are exempt from bishul akum, and are kosher even if cooked totally by non-Jews, provided that all the other requirements of kosher food are met. Commentators explain that situations involving food appropriate to formal dining are most likely to lead to intermarriage.

In contemporary observance, the mashgiach, along with supervising food preparation, typically helps start the stove and/or provides other participation in the cooking sufficent to ensure that the rule of bishul Yisrael is complied with.

In Conservative Judaism
Conservative Judaism does not observe the rule of Bishul Akum.