Mix water with sugar and yeast, sift flour, add salt and olive oil and knead the dough. Grease it with olive oil, put it in a clean bowl, cover with a towel and put it in a warm place for 1 hour.
Roll out the dough into a thin layer. Using a special mold, cut out round blanks with a diameter of 10 cm. Grease each blank with tomato paste, leaving small edges, lay out the mozzarella and fold it in half.
Deep fry the patties on both sides until golden brown. Place them on a paper towel to remove excess fat.