For the source text click/tap here: Nedarim 26
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The mishna (66a) states that if one says: Onions are konam for me, and for that reason I will not taste them, because onions are bad for the heart, and others said to him: But isn’t the kuferi onion good for the heart, the vow is dissolved with regard to kuferi onions, and not only with regard to kuferi onions is it dissolved, but with regard to all types of onions. The mishna relates that an incident of this kind occurred, and Rabbi Meir dissolved the vow with regard to all types of onions.
We explore the history of the onion in antiquity as well as a metaphor in rabbinic literature.