place the water and sugar into a saucepan and slowly bring up to the boil. Reduce the heat once the sugar has melted
add the syrup and butter and then bring up to the boil again
stirring constantly.
Turn down the heat
add the apples and cook
stirring gently
until just soft. Place into an ovenproof dish.
For the crumble
rub the flour
butter and sugar together in a bowl with your fingertips until the mixture resembles breadcrumbs. Spoon the crumble evenly over the toffee apple mixture and place in the oven to bake for 15 minutes
or until crisp and golden-brown.
For the custard
place the egg yolks and sugar into a bowl. Place the milk and vanilla seeds into a saucepan and bring to the boil
then pour into the egg and sugar mixture. Whisk until well-combined. Return the custard mixture to the saucepan and warm over a low heat until it thickens enough to coat the back of a spoon.
To serve
divide the crumble between 4-6 serving plates and place a dollop of custard on each.
