Food, in Oaxaca, is serious business. Like San Francisco, it's a foodie town, and everywhere you go, anytime of the day or night, you are surrounded by food. People set up comals on random street corners and fry up tortillas of varying shapes, thicknesses and sizes (each of which, confusingly, has a different name) with varying combinations of beans, meat, veggies and salsas. Women walk around with baskets of tamales, bags of fruit, and all kinds of tortillas. Men on bicycles and pushing carts sell ice cream, potato chips and scary-looking preserved things in big glass jars. There are taco stands everywhere -- street corners, parks, the edge of every parking lot, in the mercados.