Step 1

Heat oven to 200C/180C fan/gas Put the flour, oats, butter and sugar in a bowl, squash together with your fingers into a crumble texture, sprinkle over a baking tray and bake for 10 mins, stirring and roughly breaking up halfway through cooking. Can be done up to 2 days ahead, and stored in an airtight container.

Step 2

Meanwhile, put the strawberries, sugar and cornflour in a large pan. Stir together and set over a medium heat. Cook until the strawberries just start to release their juices and soften, then stir in the remaining berries. Transfer to an ovenproof baking dish.

Step 3

When the crumble topping is cooked, sprinkle it over the fruit, and place back in the oven for a further 15 mins until bubbling and golden. Leave for 5 mins before serving with ice cream or custard.