Answer:
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
What must be looked through in order to see?
The little pink nub that helps rectify mistakes.
What flies forever, rests never?
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.