Egg wash:
Sift the flour into a large bowl, add salt and combine.
Place the yeast and one teaspoon of sugar in a cup. Pour in half a glass of warm milk, add a teaspoon of flour and mix thoroughly. Place the mug into a pot with very warm water and leave to rise for about 7 minutes, until the mixture fills the cup.
Once it has risen, pour it into the bowl with the flour and start mixing gently with a spoon. Gradually pour in the remaining warm milk, stirring constantly with a spoon.
Add the remaining sugar, egg and continue mixing the ingredients together. When the dough starts to firm up, add in the melted butter. Knead the dough using your hands, until elastic for approx. 10-15 minutes. At the end of this time you should have a smooth ball of dough.
Place the dough into a bowl and cover with a clean tea towel. Set the dough aside in a warm place to rise for about 1 hour.
After this time, place the dough on a floured surface and give it a gentle knead. Divide the dough into 10 equal portions and form 10 balls. Place the balls of dough onto a large baking tray covered with baking paper. Allow space between each ball for the dough to rise and cover with some oiled cling film to stop the dough from drying out. Set aside again to rise for a further 30-40 minutes. Preheat the oven to 410°F (210°C).
Brush the bread rolls with the egg yolk and oat milk wash and sprinkle each roll with some sesame seeds. Place the buns in the oven and bake for 15 minutes until golden brown. Remove from the oven and cool.