Cut the salami into strips, place in a bowl. Add the tomato sauce and cheese, mix together.
To prepare the dough
Shape the pizza dough into a roll, divide into 16 portions, shape into balls. On a lightly floured surface, roll out the pieces of dough (each approx. 10 cm in diameter).
Place 2 tbsp of filling in the centre of each round of dough, shape into balls, press firmly. Arrange the dough balls (seam-side down) in a rectangle on a tray lined with baking paper. Mix the oregano and cheese, scatter on top of the pizza balls.
Approx. 30 mins. in the lower half of an oven preheated to 200°C. Remove, allow to cool slightly on a rack, serve warm.