I want to know the answer to the following question:
What is the name of the prohibition against eating grains and legumes during Passover?
All the background I'm provided with is that "For example, the now-widespread haredi tradition of cutting a boy's hair for the first time on his third birthday (upshirin or upsheerin, Yiddish for "haircut") "originated as an Arab custom that parents cut a newborn boy's hair and burned it in a fire as a sacrifice," and "Jews in Palestine learned this custom from Arabs and adapted it to a special Jewish context."". Is that enough to answer the question?
Answer: no