Apple crumble cake | Now Then Sheffield

Ingredients

• 170g/6oz butter/margarine
• 170g/6oz caster sugar
• 3 large eggs
• 170g/6oz self raising flour
• 1 1/2 teaspoon baking powder
• 6 tablespoons milk
• 2 large cooking apples and 4 dessert apples (or 8 plums)
• 1 lemon
• 1 1/2 teaspoon ground cinnamon
• 2 tablespoons granulated sugar
• 150g/5oz plain flour
• 100g/3 1/2oz cold butter
• 100g/ 3 1/2oz demerara sugar