This hot and hearty party dish comes from somewhere deep in Texas, not far from the Rio Grande. There, authentic flavors from South of the border get employed North of the border in easy, crowd-pleasing American-style main dishes called - in fractured Spanish - "casserolas". Chipotle chiles - smoked red jalapenos canned in a tangy sauce called adobo - generate a sultry heat that enlivens the lasagna-like layers of meat, beans and tortillas. Garnish each portion with crisp shredded lettuce and a cooling dollop of sour cream and set out a tub of good beers on ice. For the best flavor, make the beef mixture at least one day ahead, but for best texture, assemble the casserole shortly before baking.
