It is a crumble, the best crust for a dish of cooked bramleys and blackberries, and doesn't seem to care that i used gluten-free flour.

100g flour

75g butter

50g sugar

Whizz in a food processor for a few seconds to make a crumb. Scatter over your choice of fruit and bake in a medium hot oven until crisp, about 25 minutes.

I prefer mine served warm, with hot custard.