The double-layer pizza is basically what would result from the union between a Margherita pizza and a calzone. It sounds overstuffed—and it kind of is—but in this case I suspect that's the point.
'Ontario' on Serious Eats
From the imported ingredients to fastidious cooking methodology, Libretto is dedicated to Naples-style authenticity. They claim to bake their pies in less than 90 seconds in a 900 degree wood-burning oven (hand-built by a 3rd generation pizza oven maker in Naples, then delivered to Ontario). The pizza had all the hallmarks of a striking Napoletean pie: a blistered, slightly speckled crust made with naturally leavened Italian Caputo dopio zero flour, topped with a translucent, vermillion layer of San Marzano tomato sauce.