To Texans, barbecue is elemental. Succulent, savory, perfumed with smoke and spice, it transcends the term "comfort food." It's downright heavenly, and it's also a staff of Texas life. Like a dust storm or a downpour, barbecue is a force of Texas nature, a stalwart tie to the state's cultural and culinary history. Though the word is often shortened to "BBQ," the tradition of barbecue stands Tex…