I just learned that this recipe originated with my great-uncle Nacho. It has been a tradition in my family for a very long time - definitely not health food, but it sure is good. My grandfather used to cook these on an old cast-iron griddle over open coals, frying the tortillas in the fat released by cooking the burgers, but lately we've taken to making these indoors and frying the tortillas in vegetable oil instead, which I guess makes it somewhat healthier. The pepper jack cheese is also a recent change. Originally they were made with cheddar or american cheese.