Answer:
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
Pirates put their booty in it.
Long and slinky like a trout, never sings till it's guts come out.
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.