Cut the apples into large cubes.
Cut the strawberries into large cubes as well.
In a small bowl, cream together the butter and sugar.
Add flour to butter and sugar and rub everything into crumbs.
Place strawberries in a baking dish and sprinkle with sugar.
Place apples on top of the strawberries and sprinkle with sugar as well.
The final layer is made from crumbs of butter, flour and sugar.
Place the crumble in the oven to bake for 20-25 minutes at 190°C. The crumble should brown and become crispy.
Decorate the finished dessert with powdered sugar.