With the universal blade :
Put the buttermilk and fresh yeast into the metal bowl
Run EXPERT / 1 min / SPEED 5 / 35°C 
Add in this order : the sugar, flour, salt, the egg and egg yolk into the metal bowl
Run EXPERT / 1 min / SPEED 9 / 0°C 
Add the butter
Run EXPERT / 1 min / SPEED9 / 0°C 
With the XXL :
Put the buttermilk and fresh yeast into the metal bowl
Run EXPERT / 1 min / SPEED 5 / 35°C 
Add in this order : the sugar, flour, salt, the egg and egg yolk into the metal bowl
Run EXPERT / 5 min / SPEED 7 / 0°C 
Add the butter
Run EXPERT / 5 min / SPEED 7 / 0°C 
Transfer the dough to a floured salad bowl, cover with a damp cloth or film it
Set aside for 1 hour to rise
Place on a floured work surface and gently punch down to push the air out of the dough
Divide into 6 parts and roll the buns
Place on a lined baking tray and set aside to rise for another 30 minutes.
Preheat the oven to 180°C
Beat the egg white with a tablespoon of water
Brush the buns with it
Sprinkle with sesame seeds or poppy seeds
Bake for 15 min at 180°C
