Time Out says
You heard the cashier right: He just asked what kind of a-BEETS you’d like. The word describes the type of Neapolitan-style pizza you’ll find around New Haven, Connecticut. It’s characterized by a thin, crispy crust and mozzarella-less toppings (though Pete’s will throw some on if you ask for it). The star of the show is New England favorite New Haven, topped with clams, garlic, oregano, olive oil and pecorino romano.