1. Preheat the oven to 180℃

For the apples

1. Peel, wash, core and dice the apples.
2. Toss the apples with a few drops of lemon juice to prevent them from browning.
3. Place the apples in a saucepan, add the water, butter and sugar. Cook over a medium heat for about 6 to 8 minutes or until tender. Stirring regularly to avoid burning at the bottom.
4. Remove from the heat and pour it in a large mixing bowl and set aside to cool.

For the crumble topping

1. Place the ingredients into a large mixing bowl. Rub together using your fingertips until the mixture looks like breadcrumbs.

Assemble and bake

1. Pour the cooled apples in a shallow pie dish and level the surface using a spatula.
2. Spoonful an even layer of crumble topping on top of the apples.
3. Cook it in a preheated oven for 20 minutes. Then lower the temperature to 160°C and cook for a further 20 minutes until golden and bubbling.
4. Serve either hot or cold with ice cream or custard. Enjoy!