Preheat your oven to 200°C/180°C(fan)/400°F/Gas 6.
Put 3 Apple, 35 g Caster sugar and 0.5 teaspoon Cinnamon into a pan and heat on low until it forms a compote, about 10 minutes.
Unroll 375 g Puff pastry and cut into six equal squares.
Put ⅙ of the apple mixture into the middle of each square. Fold over the pastry corner to corner, to form a triangle. Use a fork to crimp and seal the pastry edges.
Put the turnovers onto a lined baking tray, brush with 1 Egg and cut a small hole in the top of each turnover. Sprinkle over 5 g Caster sugar.
Put in the centre of the oven and cook for 18-20 minutes, until golden on top and they have puffed up. Leave to cool on a rack and dust with Icing sugar (optional).
Notes
Make sure you chop all the apples in similar sizes. This makes sure that they all cook evenly.
You can swap the cinnamon for nutmeg or ground ginger, or use a mixture of all three.
Take these apple turnovers to the next level with a drizzle of caramel sauce before serving.
You can swap half the apples for pears for something a little different.
If you don't want a strong cinnamon flavour (which we personally love), then you could add a cinnamon stick to the apples and just take it out before serving.
Vanilla is also a delicious addition. Just a little vanilla extract or vanilla paste goes a long way.