Nikki Hill and Claire Wadsworth stand in the ever-busy dining room of their daytime restaurant La Copine, a magnet for people visiting Yucca Valley. (Bill Addison / Los Angeles Times)
In the north of Yucca Valley, along a parched desert road, a white shoebox of a building appears on the horizon, mirage-like. Most days you’ll spot it by its full parking lot, because La Copine isn’t just a destination for desert dwellers. Tourists and celebrities travel from other cities, states and even countries for a taste of California through the lens…