Answer:
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
What do you throw out to use and take in when you're done?
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
What an fill a room but takes up no space?
Long legs, crooked thighs, little head, and no eyes.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.