Mix the flour with the salt and sugar.

Add an egg.

Mix the milk and water that has cooled slightly or at room temperature, no more than 30 ° C otherwise it will kill the yeast. Add the yeast and let it dissolve.

Knead the dough with a dough hook in a food processor or by hand in a large bowl until you obtain a smooth dough.

Gradually add the butter at the end.

Cover with a damp cloth or plastic wrap and let the dough rise for 2 hours to double in size.

Flour your work surface and pour the dough.

Divide the dough into 9 equal parts.

Shape balls.

Place on a sheet of baking sheet well spaced because the buns will inflate.

Cover with a cloth.

Leave to rise for 30 minutes.

Preheat the oven to 200 ° C.

Mix the egg yolk with 1 tbsp. of water.

Apply to buns with a brush.

Sprinkle with sesame or poppy seeds.

Bake for 15 minutes till golden brown.