If you've ever eaten at California Pizza Kitchen, chances are you've tried the restaurant's most signature menu item, its BBQ chicken pizza. The unconventional pie, which was introduced at the opening of CPK's Beverly Hills restaurant in 1985, became instantly popular and opened the door to the idea of nontraditional toppings on a pizza crust. While the all-American combination of sweet and spicy barbecued chicken, gooey cheese, and hearty pizza crust has been copied all over the world, we went behind the scenes at CPK's test kitchen to learn exactly what goes into the original. See how it's made, then get the recipe.">