View photos of the edible cactus Carnegiea gigantea (Saguaro), profiled in Sonoran Desert Food Plants.

A passage from Sonoran Desert Food Plants:

Saguaro is rated by some to have the best tasting fruit of any cactus. Once knocked from the cactus’ growth tip, each fruit is simply split with a knife. The internal fruit/seed material is then scooped out and eaten or prepared as a jam, jelly, drink (alcoholic and otherwise), or even dried in sheets as ‘fruit jerky’.