Apple crumble using a klarstein - KudoCook

Ingredients

• 150g flour
• 100g cold butter, cut into cubes
• 75g icing sugar
• 1 pinch of salt
• 6 apples (e.g. Granny Smith), peeled, cored and chopped
• 25g brown sugar
• 1 teaspoon ground cinnamon
• 20g butter
• 50ml water