Step 1

Preheat the oven to 180*C/350*F/ gas mark 4. Butter a six cup deep baking dish. Set aside.

Step 2

Whisk together the flour and sugar for the cake part. Whisk together the melted butter, egg, milk and maple syrup. Stir the wet mixture into the dry mixture. Whisk together to combine. Stir in the apple and spread into the baking dish.

Step 3

Put all of the ingredients for the topping together in a saucepan. Bring just to the boil stirring to melt the sugar. Pour evenly over top of the batter in the baking dish. Do NOT stir to mix together. Bake in the preheated oven for 40 to 45 minutes, until a toothpick inserted in the centre of the cake comes out clean. The liquid mixture will have sunk to the bottom creating a sauce.

Step 4

Dust with cinnamon sugar and serve warm, spooned into bowls and topped with whipped cream or ice cream if desired.