I edit a lot of recipes...and it's a little like detective work (I knew my Nancy Drew training would eventually come into play) trying to suss out what a recipe creator means when they* call for "a large handful" or "a generous glug" or [wait for it] "a bunch."
Let's consult the dictionary for a definition of bunch:
"a group of things of the same kind that are held or tied together or that grow together"There is nothing in the definition that implies a quantity (even for things that "grow together," like grapes or bananas). In fact, the size of a bunch is controlled by custom. And since customs change pretty much constantly, calling for a bunch of something in a recipe is extraordinarily imperfect.
Here, peeps of the jury, is a "bunch of basil" from a farmers' market:
And here's a "bunch" from the supermarket:
I rest my case.
*On a separate note, I've finally given in to the use of "they" to indicate an individual of unknown gender......but I am not happy about it.