Place the flours, bicarbonate of soda and cinnamon in a large bowl and mix to combine. Reserve a small handful of the Walnuts and add the rest to the flour with the apple and sultanas.
Stir in the buttermilk to form a rough dough and knead lightly to form a round. Place on a lightly floured baking tray and make a deep cross with a sharp knife. Scatter with the reserved Walnuts.
Bake for 30-35 minutes until golden. Drizzle with the maple syrup to serve.
Cooks tip
Great to serve with cheese, soups or simply toasted with butter. Try grated pear instead of apple.