Preheat the oven according to puff pastry package instructions.

In a mixing bowl, combine beef mince, finely chopped onion, panko breadcrumbs, whole egg, minced garlic, crumbled beef stock, cooking salt, and black pepper.

Add chopped pickled jalapeños, cheddar, and parmesan to the mixture and combine thoroughly.

Roll out the puff pastry sheets on a floured surface and cut them into rectangles.

Place the meat mixture along one edge of each pastry rectangle and roll it up, sealing the edges with the separated egg.

Brush the tops of the rolls with the egg and sprinkle with sesame seeds.

Place the sausage rolls on a baking tray lined with baking paper.

Bake in the preheated oven for 50 minutes or until golden brown.

Serve with Aussie tomato sauce or ketchup.