This crumble topping is the one I come back to time and time again. It’s buttery and has bite to it rather than the sandy breadcrumbs of the crumbles of my childhood. Use it with any of the summer’s bounty and adapt it with flavour enhancers like lemon or orange zest, spices like cardamom and cinnamon or additional ingredients like desiccated coconut.
For the blueberry filling:
800g blueberries
100g sugar
Zest of 1/2 lemon, about 2 tsp
Juice of 1 lemon
1 tbsp flour
1/2 tsp cornflour
For the crumble:
150g plain flour
150g rolled oats
175g sugar
200g cold butter, cut into small pieces
Zest of 1/2 lemon, about 2 tsp
Pinch of salt
2 large bowls
1 large casserole
Baking dish