Place sirloin, pepperoni, Parmesan cheese and pizza sauce into a large bowl. Mix ingredients until well combined. Using your hands form 8 burger patties. Place burgers on a tray. Preheat barbeque to 375°F/190°C or medium high heat.

Oil the grill. Drizzle burgers with oil and season with salt and pepper. Place burgers on grill and cook for 5 minutes on each side. Place a slice of cheese on each burger for final minute of cooking. Place buns on grill for 1 minute or until toasted. Close lid and allow cheese to melt. Remove burgers and serve on toasted buns.