Grease and line an 11x33cm rectangular tart tin.
Prepare the pastry according to the instructions on the packet. You will need to take it out of the freezer and into the fridge the night before.
While the pastry is baking, prepare the filling by beating the butter and sugar until light and fluffy.
Add the eggs, one at a time and mix just until they're incorporated.
Carefully stir the almond meal and flour into the mixture then spread it into the pastry case.
It will seem like there's not enough but don't worry it rises quite a bit.
Arrange the sliced apple and blueberries on top of the filling then brush the apples with the extra melted butter.
Bake the tart in a pre-heated 180C fan-forced oven for 30-35 minutes or until it is golden on top.
Leave the tart in the tin to cool completely.
Dust with icing sugar before serving.