Combine the dry ingredients (except the walnuts) in a mixing bowl (
you can either use a kitchen machine (if you have a dough hook for it), a bread baking machine or your hands), stir to combine and add the olive oil and water. Knead until a smooth dough ball comes together. Adjust the dough: If it's too dry, add more water, if it's too sticky, add more flour. At last, knead the walnuts into the dough.