It's an

[chully]

Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
Mushroom-Mushroom!
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
Mushroom, Mushroom.
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
A-Mush-A-Mushroom!!
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
STEAK! Steak!!! NOOOO OH TEH NOES ITS A STEAAAAAAAAAAAAAK!
It's an
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
Mushroom-Mushroom!
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
Mushroom, Mushroom.
Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion Onion
A-Mush-A-Mushroom!!

(the previous content is in no way supported by The National Onion Association.