Put all the ingredients, except the butter in the mixer (this dough cant be done by hand). Develop the dough, and later add the butter until incorporated. Mix until the dough is smooth. Take the dough from the mixer, and shape it into a ball.
Let the dough rest for aproximately 20, or as it feels fluffy.
Divide the dough into 500 gram pieces, and shape into a log. Put in a greased loaf pan and let proof until it has gone above the sides of the loaf pan. Egg wash before baking.
Preheat the oven to bake at 350°F and bake for 30 minutes. Then tent lightly with a foil and bake for 15 more minutes.