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Heat the oil and butter in a frying pan and soften the onions, stirring frequently, for 10 minutes. Add the sausagemeat and chopped apple to the pan; use a wooden spoon to break up the sausagemeat into small pieces. Cook with the onions for 10 minutes over a medium heat, stirring. Add the chopped rosemary and leave to cool.
Preheat the oven to 240°C, gas mark 9. If using a pizza oven, bring to cooking temperature. Roll out the pizza dough balls on a lightly floured surface to make two 25cm pizza bases. Place each one on an oiled baking sheet.
Top the pizza bases with the sausagemeat and apple mixture, then bake for 10-12 minutes until bubbling and golden. Divide the chopped mozzarella and rosemary sprigs between the 2 pizzas and return to the oven for 5-6 minutes to melt the cheese.