Place the flour and sugar into a large mixing bowl.
Cut the butter into small cubes, and add to the flour and sugar.
Rub the butter into the flour and sugar, using your fingertips and thumbs, until a clumpy crumble forms. At this point you can refrigerate or even freeze the mixture.
To make the filling, place the butter in a large pan, add the fruit and cook just until the juices start to run. Add sugar and other seasonings to your taste (see article for ideas). And place into a 9 inch (23cm) pie dish.
Scatter over the crumble and bake for 35-40 minutes, or until the fruit is bubbling and the crumble is golden and crisp.
Recipe by The Sugar Hit at http://www.thesugarhit.com/2016/02/the-crumble-formula.html