There's no such thing as a free lunch — at least not for the city's Muslim and Jewish schoolkids.

Religious leaders sent Mayor de Blasio a letter slamming the city's free universal school lunch plan for not not offering kosher or halal food.

De Blasio rolled out the federally funded program promising to give all city students free meals with the first day of public school on Sept. 7.

But influential Jewish and Muslim leaders say thousands of Jewish and Muslim kids — including 30,000 students in Yeshivas and thousands of eligible Muslim kids — aren't getting the free meals because none of the food is certified kosher or halal.

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