Preheat oven to 350F, roast the walnuts for about 10 minutes, let them cool.
Mix all the ingredients except for the walnut by hand or in an electric mixer with the dough hook attachment, knead until you have a smooth and silky dough. Add the walnuts and knead by hand until the walnuts are evenly distributed.
Let it rise at room temperature until almost doubled in volume, fold and let it rise again, divide and shape the loaves.
You can let the loaves proof at room temperature and bake in an oven preheated to 450F or retard in the fridge overnight and bake the following day, a thermometer inserted in the middle should register 205-210F.