Walnut Bread is equally good with cheese or toasted and slathered with butter and honey. Walnut pieces give the loaf a satisfying crunch, while a few ground ones distribute the flavour throughout. You'll need some recently fed, lively sourdough starter for this recipe.
In a bowl, mix all the ingredients together to form a paste. Set aside.
Put the flours, salt, dried yeast and walnuts in a large bowl then set aside.
Whisk the sourdough starter into the water then stir in all the walnut paste.
Pour all the water/starter/walnut paste liquid into the large bowl containing the flour mixture.
Cover the bowl and leave overnight or 12-14 hours.
After 30 minutes, reduce the heat to 200C. Remove the pot from the oven, take the bread out of it and put the bread back in, directly onto the oven shelf. Bake for a further 15-20 minutes until the bread is cooked through. If necessary, reduce the oven temperature to stop the crust over browning before the loaf is finished baking.
Recipe adapted from Dan Lepard's highly recommended book, The Handmade Loaf.