Answer:
Long and think, red within, with a nail at the end.
I work when I play and play when I work.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
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.
I have legs but walk not, a strong back but work not. Two good arms but reach not. A seat but sit and tarry not.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.