Answer:
What grows when it eats, but dies when it drinks?
What can speak without a tongue and listen without ears?
I'm a ring of sliced onion dipped in batter and then deep fried.
You do this into someone's ear when you want to be discreet.
This is a shape and a symbol that we literally cannot live without. What is it?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.