In a small bowl crumble yeast and mix with 5 tbsp. of the warm milk and one tbsp. of the white sugar. Let the yeast work for 5-10 minutes.
In another bowl whisk together flour and the rest oft the sugar and salt. Then add the yeast mix, the rest of the milk and the melted butter. Knead until a smooth dough comes out. Now cover with a cotton dish towel and put it at a warm place and let the dough work again for 60 minutes.
Roll out on a floured surface into a rectangle.
For the filling: Spread melted butter all over dough. Mix sugar and cinnamon and sprinkle over buttered dough. Beginning at the bottom side, role up dough and pinch edge together to seal. Cut into 1 -2 cm slices.
Preheat oven to 175°C and prepare a baking tray by layering with baking paper. Place cinnamon buns onto the prepared baking tray.
Bake for 20-25 minutes.
For the glazing: Combine confectioner's sugar and water and sprinkle over the buns. Best served warm!