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Split hamburger buns and place on a baking sheet.
In a small bowl, combine sugar and tomato paste; mix well. Brush the tomato paste on top of each half of the hamburger buns.
Spoon the browned hamburger on top of each bun half, completely covering.
Place sliced mushroom and sliced black olives on top of each bun half. Sprinkle with shredded mozzarella cheese.
Bake at 400° F (205°C) for 10 to 12 minutes.