spanish onion

hi gang
today ive got a good question. my flat mates on a diet which he takes very serious (maybe to serious ) .Anyway my dilemma begain with a simple misunderstanding when my flat mate said I would make fun of you if you were on a diet.So seeing this as an oppertunity for fun I decided to mention the fact that he has decided to eat spanish onions ( for what reason i still dont know)for a snack.Anyway i got a fair bit of abuse from this (I still think its odd)so I would like to know it any one eats spanish onion like an apple mind you or if you know some one who dose or even if you know someone who knows some one i would like to know thanks for your time all the best don