Answer:
The root tops the trunk on this backward thing, that grows in the winter and dies in the spring.
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.