Well whatever I can find. Usually pre cooked chicken, cheese and whatever else is lying around. (Used tomatos, lettuce, jalopenos, etc.). Today I ran out of chicken so I went on a limb and put deli ham in its place with a teaspoon of newmans own caeser dressing in replace of the gringo mama salsa from dierbergs (local chain, stl ((saint louis abbrevated) the only place in the world where Walmart is afraid to go to (they end up getting thrown out of town)).
Suprising as usual whatever I do seems to work. For a guy who never took a cooking class in his life and only figured things out by trial and error and by watching them do it at taco bell, I'm pretty good.