01 - In a large bowl, mix the bread flour, active dry yeast, fine sea salt, and brown sugar thoroughly.
02 - Create a well in the center and pour in warm water and olive oil. Stir until the dough begins to come together.
03 - Transfer the dough to a floured surface and knead for 8 to 10 minutes until smooth and elastic.
04 - Gradually knead in the chopped walnuts until evenly dispersed throughout the dough.
05 - Place the dough in a lightly oiled bowl, cover with a damp towel or plastic wrap, and allow it to rise in a warm area for 60 to 90 minutes until doubled in size.
06 - Deflate the dough and shape it into a round or oval loaf. Position the loaf on a parchment-lined baking sheet or greased loaf pan.
07 - Cover and leave the dough to rise again for 30 to 40 minutes until it becomes puffy.
08 - Heat the oven to 400°F (200°C) during the final rise period.
09 - Make several slashes on the surface of the loaf with a sharp knife to allow steam to escape.
10 - Bake for 30 to 35 minutes until the crust is golden brown and the loaf sounds hollow when tapped on the bottom.
11 - Transfer the baked bread to a wire rack and cool completely before slicing.