When I was a child my family spent six months in Arizona. Everything was new to me from the wild burro's in the hills to the panthers that came to fight over our garbage can at night. One of the things I remember is Hispanic women setting up to cook near a depot. In a very hot summer they would use a large rock as a 'stove' to lay their corn tortillas and meat on and add cheese to prepare a lovely 'sandwich' type meal and wrap it in a corn shuck. They would then go along the passenger cars exchanging this little 'sandwich' for a few coins through the windows and open cars. Being a friendly little child and looking so different than the townspeople I managed to make many friends and sample a few good things. I have never been able to re-create the taste. It was unique and delicious..... and the cooks were quiet, adept and beautiful.