Down here in the Sonoran desert, I like to pick and eat mesquite beans. They're nice and sweet when it's early in the season, and later when they dry out, they can be ground up and used with wheat flour to make tortillas, cookies, bread, pancakes etc.... Also like paddle cactus. Paddle, (nopales) and the prickly pear itself, (tunas).  I've got friends on the rez who also harvest and eat the cholla cactus, and agave. There's an amazing amount of wild food in this desert.