Answer:
What starts with an "e" but only has a single letter in it?
A seasonal fashion statement named for the weather it's worn in.
I'm a ring of sliced onion dipped in batter and then deep fried.
What has one head, one foot, and four legs?
What is at the end of every rainbow?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.