Answer:
You heart it speak, for it has a hard tongue. But it cannot breathe, for it has not a lung.
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
There are two meanings to me. With one I may need to be broken, with the other I hold on. My favorite characteristic is my charming dimple.
You heard me before, yet you hear me again, then I die. Until you call me again.
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.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.