Preparation:
1. Place 1/4 cup flour, salt, 1 tablespoon sugar and warm milk in a bowl.
2. Mix and let sit for 30 minutes until fermented.
3. Place remaining flour, sugar and room temperature butter in a large bowl.
4. Mix with your hands until sandy, add egg and mix.
5. Place on a smooth surface, make a hole and add fermented dough. Integrate and knead.
6. Knead until soft, smooth and elastic. Cover and let rest with a tea towel and let rest for 30 minutes.
