Put whole wheat flour, yeast, salt, milk, sugar, and butter into a bowl and knead the dough.
Cover the dough with plastic wrap and let it rise in a warm place for 1 hour for the first fermentation.
Divide the dough into 8 to 10 pieces and shape them into balls.
Place on a baking pan and let rise for 30 minutes for the second fermentation.
Bake in a preheated oven at 180°C for 15-20 minutes.
Transfer to a cooling rack to cool.