Plot: We find Rick and his daughter, Lanie, at the Mexico City’s colorful Sonora Market, an emporium of medicinal herbs and the best place in town to buy cazuelas, the beautifully rustic earthenware cooking and serving casseroles that define a whole class of stews and taco fillings. We tend to think of taquerías for their familiar grilled and griddled fillings, like carne asada