In a standing mixer with the hook attachment, add all-purpose flour, salt, sugar and if you are using dry yeast, stir well all the dry ingredients together. If you are using fresh yeast, add it together with egg yolks, melted butter and start kneading on low speed. Knead the dough in a standing mixer, until it starts coming together. Then knead for an additional 5-10 minutes, until you see the dough is soft and stretchy.
4 cups (550 g) all-purpose flour, 1 pinch salt, 50 g (50 g) soft butter, 2 large egg yolks