Combine ground Italian sausage and ground beef and form into a patty that's slightly larger than the size of your pizzas and season with your choice of seasonings.
Cook frozen pizzas according to the directions on the package.
Pre-heat your grill on high for 10 minutes and grill your giant burger patty for 3 - 5 minutes per side until it reaches your desired level of doneness.
Top your burger patty with pizza sauce and mozzarella cheese and grill for another minute or until the cheese is melted.
Assemble your burger by placing your burger patty between the two pizzas and then slice the giant pizza burger into four equally-sized portions.
