There are collaborations that feel focus-grouped into existence and then there is Ample Hills Creamery turning an entire loaf of Zabar’s cinnamon babka into ice cream. The Brooklyn-born scoop shop is teaming up with the Upper West Side institution (which is not certified kosher) on Holy Babka!, a limited-edition flavor arriving at all four Ample … Ample Hills and Zabar’s are turning an entire babka into kosher ice cream