Classic Apple Crumble

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1.5 kg mixed apples (I like to use half Bramley)

150 g golden caster sugar

1 lemon

50 g unsalted butter (cold)

100 g plain flour

Preheat the oven to 200°C/400°F/gas 6.Peel and core the apples, then quarter and chop into 3cm chunks.Place in a saucepan on a medium heat with 100g of sugar and a few fine gratings of lemon zest.Pop the lid on and cook for 5 minutes, or until the apples have softened. Remove the heat and leave to cool a little.Meanwhile, cube the butter and place in a mixing bowl with the flour. Rub together with your fingertips until it resembles breadcrumbs, then scrunch in the remaining sugar to add a little texture.Transfer the apples to a 25cm x 30cm baking dish and sprinkle over the crumble topping.Bake in the oven for 25 to 30 minutes, or until golden and bubbling. Delicious served with vanilla custard.