Mix all the dry ingredients, add the melted butter, egg yolks, rum and warmed milk, knead a smooth elastic dough. Cover with a towel or foil and leave for 30 minutes to approach. Divide into 3 equal parts, each of which roll into a long sausage. Weave braid of them, put on a baking sheet, greased and leave for another 30 minutes. Coat with egg white and bake 35 minutes at 180 degrees Celsius.