Preheat the oven: Preheat the oven to 180°C (350°F).

Prepare the dough: Roll out the 400 g of yeast puff pastry into a rectangle about 3-4 mm thick. Spread a thin layer of ketchup (2-3 tbsp) evenly over the pastry.

Layer the fillings: Spread the 150 g of bacon evenly across the dough, followed by 100 g of shredded mozzarella.

Roll and slice: Roll the dough tightly into a log, and slice it into 2-3 cm thick rolls.

Bake: Place the rolls on a parchment-lined baking sheet. Brush with olive oil and bake for 15-20 minutes until golden and crispy.

Garnish: Once baked, garnish with chopped parsley and serve.