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Combine the ground beef, Italian seasonings and salt in a large bowl and mix gently. Form into 12 thin patties and place on waxed paper. Combine the pepperoni, 1/3 cup pizza sauce, mustard, and Parmesan cheese in a small bowl. Divide this mixture among 6 patties within 1/2-inch of patty edges.

pizza is (uncountable) a baked italian dish of a thinly rolled bread dough crust typically topped before baking with tomato sauce, cheese and other ingredients such as meat, vegetables or fruit while hamburger is a hot sandwich consisting of a patty of cooked ground beef, in a sliced bun,