onions and garlic are well-known natural aphrodisiacs, even from ancient times. So, if one is trying to establish oneself in brahmacariya, it is good to avoid them. Asafoetida (hing) is supposed to replace them somewhat in terms of flavour (well, that's what I was told years ago, in my Hindu vegetarian cooking classes), but without
the side effect of increasing sex drive.
Then the Blessed One, picking up a tiny bit of dust with the tip of his fingernail, said to the monk, "There isn't even this much form...feeling...
perception...fabrications...consciousness that is constant, lasting, eternal, not subject to change, that will stay just as it is as long as eternity."