Preheat the oven to 180°c (160 fan/ Gas 4/ 350F) and grease and line a 2lb loaf tin with non stick parchment paper.
Place the butter, sugar, eggs, flour, baking powder, and caramel sauce into a large mixing bowl and beat with a wooden spoon until all of the ingredients are combined. You can use an electric mixer if you prefer.
175 g Salted Butter, 200 g Caramel Sauce, 50 g Light Brown Sugar, 3 Eggs, 175 g Plain Flour, 1 teaspoon Baking Powder
Fold in the chopped apple and pour the cake mixture into the prepared tin.
2 Bramley Apples
Bake for 30 minutes then remove the cake from the oven and cover with foil. Return to the oven and bake for a further 20-25 minutes until a skewer comes out clean.
Allow the cake to cool, then remove it from its tin onto a cooling rack and drizzle the top with 2 tablespoons of caramel sauce (thinned to a drizzling consistency with a drop of water). Sprinkle over the walnuts and serve.
2 tablespoon Caramel Sauce, 1 teaspoon Water, 3 tablespoon Chopped Walnuts