You've heard of wood-oven and coal-oven pizza, but now there's lava-rock-oven pizza. In Princeton, New Jersey, next to the Sam's Club there, is a pizzeria using an oven filled with lava rock, in an attempt to achieve superhot, even cooking temps. New Jersey Monthly has the deets on Magma Pizza:
Order a slice, and you’ll get a strange oval shaped thin crusted pizza. Try it, and you’ll realize [owner Gabe Mahayni] may just have found the secret. The pizza is light from the grill, no grease or drip, just great flavor so each bite leaves you wanting more. The pies are round, and compellingly fresh as well. The calzones, and everything else is constructed before your eyes, and ready in a flash.