Ingredients:

For the Base:
4 hamburger patties

For the Topping:
some pizza sauce, about a tablespoon per patty, or you could just mash a canned peeled tomato or two and mix it with a teaspoon or so of tomato puree
mozzarella cheese sliced, enough to cover 4 patties or about a handful of grated dry mozzarella
pepperoni, about 6 thin slices quartered. You could also use chorizo or salami
2 pinches dried oregano
1/2 pinch dried chili pepper
1 pinch ground black pepper

For the Rolls:
2 rolls
butter

Methods:

Add the oregano, pepper and chili to the pizza sauce/tomato and mix through.

The patties should preferably be broiled under a grill or cooked on a Weber-like barbecue with the lid on.

Grill/broil the patties until half cooked and flip them over. Barbecue:- immediately spoon the sauce onto the patties, cover liberally with cheese, top off with the pepperoni (the quartered slices makes it easier on a small surface) and put the lid on the barbecue. Oven/Broiler:- wait a minute or two after turning the patties before you add the toppings. The burgers are ready when the cheese has melted.

Split the rolls and toast the cut surfaces lightly (under grill, on barbecue or in a dry pan) just before the patties are done. Spread a little butter on the toasted surfaces, add the patty and enjoy a great tasting Pepperoni Pizza Burger.

You could use 4 rolls and top the patty with the other half but I prefer them this way.