Gluten Free Chocolate Meringue Pie

Ingredients

• 350g Walker's Gluten Free Shortbread (roughly 3 packs) (for the base)
• 2 tbsp cocoa powder (for the base)
• 100g butter, melted and cooled (for the base)
• 300ml double cream (for the filling)
• 300g chocolate (for the filling)
• 55g butter (for the filling)
• 100g egg whites (3–4 eggs) (for the meringue)
• 200g caster sugar (for the meringue)
• 45ml water (for the meringue)
• 1⁄4 tsp cream of tartar (for the meringue)