Mince the onion and carrot. Dice the potato into 7mm cubes and soak in water to remove starch. Mince the garlic after crushing it and removing the core.

Heat salad oil and garlic in a pan over low heat until fragrant. Add ground meat and cook over medium heat until partially browned. Add onion, carrot, and potato, and sauté for about 5 minutes until softened.

Add ketchup, Worcestershire sauce, salt, and pepper to the pan. Stir until well combined. Add breadcrumbs and mix thoroughly. Transfer the mixture to a tray to cool.

Roll out semi-thawed puff pastry sheets into 15x15cm squares. Divide each sheet into thirds.

Place 1/9 of the filling and some shredded cheese onto each pastry square. Fold the pastry over and seal the edges by pressing with your fingers and a fork.