For the dough

• 50 g 50 fresh yeast or 10 g dry yeast
• 500 ml lukewarm whole milk
• 100 g butter (soft)
• 1 egg
• 1 tsp fine salt
• 800 g strong white bread flour (plus more to dust)
• 1 egg (lightly beaten)

For the filling

• 200 g butter
• 100 g caster sugar
• 3 tbsp ground cinnamon

For the icing

• 200 g icing sugar (confectioner’s sugar)
• 1 tbsp 1-2 boiling water