Answer:
I'm a ring of sliced onion dipped in batter and then deep fried.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
Before Mount Everest was discovered, what was the highest mountain on Earth?
If you are to keep it, you must first give it to me. What is it?
It speaks without a tongue, and listens without ears.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?