Pre-heat the oven to 220C (200C fan forced).
Line a tray with baking paper and set aside.
Cut the puff pastry in half with a sharp knife.
Cut each pastry half again into thirds. You should now have six pieces of pastry.
Mix the applesauce and ground cinnamon together.
Divide the spiced applesauce equally between three of the pastry pieces. Spread the sauce down the centre of each pastry piece, leaving a 1 cm border around the edge of the pastry.
Brush the border around the edge of the pastry with the milk.
Place a second piece of pastry gently on top of the applesauce, carefully lining up the edges.
Press the edges of the pastry together firmly with a fork to seal.
Place the turnover on the lined baking tray. Repeat with the other two turnovers.
Mix the sugar and extra cinnamon together in a small bowl.
Brush the tops of the turnovers with milk.
Sprinkle over the cinnamon sugar.
Bake the turnovers for 10 minutes.
Reduce the oven temperature to 180C.
Continue to cook for a further 5 minutes, or until the turnovers are well risen and golden brown.
Serve warm with cream or ice cream.