Crumble the yeast in a bowl and add some milk on it.
Melt the butter and pour the remaining milk on it.
Add everything together and add the flour, 100g sugar, one egg, salt and ground cardamom. Knead the dough during 10min in a kneading machine.
Let the dough rest covered during 30min.
Roll out the dough 3mm thick and 30cm large. Spread the butter on it.
Mix the sugar and the ground cinnamon and sprinkle it over the dough.
Roll the dough and cut it in +- 25 pieces. Let it rise under a towel for about 30min.
Beat the egg with water, carefully brush the rolls with it and sprinkle with pearl sugar.
Bake in a hot oven at 220°C for about 10-15min.