preheat oven 190C / 170C fan
Peel, core and slice the apples to about 5mm thick slices
place the apple slices into a heavy pan with 90g caster sugar
make sure the apple slices are evenly coated and let them stew
while the apples are stewing, add 30g butter and 30g demerara sugar to small saucepan and allow to melt to make a light caramel, around 3 minutes
add the caramel to the apples along with the blackberries and let them stew for further 2 minutes
pour the apple mixture into a dish
place the remaining sugar and butter into a baking bowl and add in the flour. Rub this mixture together with your fingers to make your crumble topping
sprinkle your crumble topping over of the apple and blackberry mixture, smoothing it out to make it even
bake in the preheated oven for 15-20 minutes or until lightly golden in colour
Serve with a generous dollop of fresh cream or ice cream. Enjoy!