1 - Heat oven to 190C/170C fan/gas 5.

2 - Tip the flour and sugar into a large bowl.

3 - Add the butter, then rub into the flour using your fingertips to make a light breadcrumb texture.

4 - Do not overwork it or the crumble will become heavy.

5 - Sprinkle the mixture evenly over a baking sheet and bake for 15 mins or until lightly coloured.