“To add too much fried onion.”

To exaggerate or embellish a story.

Heard in the wild

ماجرا اون‌قدرا هم ترسناک نبود، پیاز داغشو زیاد کرده.

It wasn't really that scary. He's laying it on a bit thick.

A note

Golden fried onion (piâz dâgh) tops many Persian dishes; a little is lovely, too much gives the game away.

More food on the mind

نون به نرخ روز خوردن
nun be nerkh-e ruz khordan
“To eat bread at today's price.”
To be an opportunist who changes opinions and loyalties to suit whoever is on top.
بادمجون بم آفت نداره
bâdemjun-e bam âfat nadâre
“Eggplants from Bam never get blight.”
Nothing can harm a tough old weed. Usually said jokingly about yourself, or about a rascal who always comes out unscathed.
آش نخورده و دهن سوخته
âsh nakhorde va dahan sukhte
“Didn't eat the soup, burnt my mouth anyway.”
Taking the blame or the punishment for something you didn't do, or didn't even get to enjoy.
همون آش و همون کاسه
hamun âsh o hamun kâse
“Same soup, same bowl.”
Nothing has changed, whatever was promised.