I'm a little confused by some of the terms here. I always understood that the raw masa version that is deep-fried is called an empanada - at least that's what they were called in Mexico City when I got them on the street, unless my mind is failing me, which is a distinct possibility. I don't remember flour tortillas being common in Mexico at all, but that could be an oversight. There is a good Mexican restaurant a few blocks from me called Casa Blanca (with many photos of Humphrey Bogart - I am in Los Angeles, after all) that has a woman sitting in the middle of the dining room constantly making fresh flour tortillas by hand, and I will definitely eat them there, but otherwise I prefer corn tortillas. However, I do use flour tortillas to make less Mexican style quesadillas, such as with ham and cheese, or asparagus, mushrooms, etc, and I often actually end up making a burrito instead of a quesadilla. I think quesadilla means different things in different areas, just as empanada means something different in different regions. Is anyone else familiar with masa empanadas? I buy fresh masa (not frozen) at a Cuban market, and it can be used for tamales, tortillas, or empanadas, and I generally use it for empanadas. It doesn't keep well, however, and so I've tried freezing it, but I need to remember to freeze it in small batches. I tend not to make corn tortillas because I get adequate ones here at the local markets, although it's not the same as buying them on the street in Mexico.