I can sizzle like bacon, I am made with an egg, I have plenty of backbone, but lack a good leg.
I peel layers like onions, but still remain whole, I can be long like a flagpole, yet fit in a hole.
What am I?
This was Gollum's final riddle from The Hobbit:
"This thing all things devours;
Bird, beasts, trees, flowers;
Gnaws iron, bites steel;
Grinds hard stones to meal;
Slay king, ruins town,
and beats a mountain down."