Place the chopped apple, caster sugar, lemon juice and cinnamon in a saucepan with a splash of water. Cook gently for 10 minutes until the apple softens but some chunks are still visible.
300 g cooking apple, 30 g caster sugar (superfine sugar), 1 tbsp lemon juice, ½ tsp ground cinnamon
Put the butter, light muscovado sugar and golden syrup in a tub or bowl and melt in the microwave. This takes 2 minutes in my microwave until fully melted.
125 g butter, 100 g light muscovado sugar, 4 tbsp golden syrup
Place the oats, sultanas, cinnamon and flaked almonds in a bowl and pour the melted butter mixture over it. Combine well.
250 g oats, 70 g sultanas, 1 tsp cinnamon, 30 g flaked almonds
Line a square baking tin with baking paper and then spread two thirds of the oat mixture into the base of it. Press down well.
Spread the cooled stewed apple mixture over the oats and then place the remaining third of the oat mixture over the top, again pressing down well.
Bake at 180℃ / 350℉ for 30 minutes, until golden on top.
Remove from the oven and allow to cool. The flapjacks will harden as they cool so score while warm, leave to cool in the tray, and then remove and cut fully apart once cool.