Dissolve the yeast and sugar in the water. In a small bowl, lightly beat the eggs. In a food mixer fitted with a dough hook, place the flour. Add the yeasty water and mix for 1-2 minutes on a low speed.
Gradually add the eggs and salt. Mix for 8-10 minutes until the dough is silky. Add the butter a little at a time, mixing until the dough is silky again before adding more. Place the dou