The universal recipe for a good guacamole, says Rocky Barnette, is perfectly ripe avocados, a good balance of salt, and lime. But he’ll also let you in on a little secret: the trick to a great guacamole is “a sneaking suspicion of cumin and a healthy drizzle of very fine extra virgin olive oil.” The chef of The Capri, the buzzy Marfa restaurant that’s become a symbol of the West Texas town’s artistic revival, recently released a new cookbook with his wife, Ballroom Marfa founder Virginia Lebermann. Called *Cooking in Marfa: Welcome, We’ve Been Expecting You*, it’s half recipes, half visual homage to the rolling plains and stark desert landscape that envelopes this remote, creative oasis. Their guacamole certainly isn’t the most interesting dish in the cookbook (that title...