Answer:
A small hill with seven holes.
It can be clear like water, but it burns like fire.
Thanks for such treasures as Mariachis, enchiladas and habanero!
Blind but cruel.
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
It produces a flower but it is not its fruitΝΎ it produces branches which are its fruit.