The Arizona wine scene continues to show us the spirit of discovery and experimentation is alive and well. A common thread is the continuing search for grape varietals that can do well here. Enter Arizona wine pioneer Kent Callaghan’s latest discovery: Xarel-lo. Hailing from the northeastern Spanish region of Catalonia, the white varietal is one normally found in the ubiquitous sparkling Cava. Callaghan tells me that his interest “began with a trip to Barcelona in...