Pan de Siosa, a soft, pull part bread topped with generous toppings of butter, sugar and cheese! It is a delightful bread that you will surely make again and again.
In a mixing bowl, combine yeast, warm water and about a teaspoon of sugar. Let this stand for 5 minutes, or until it is foamy. Add milk, egg, softened butter, sugar and salt. Stir everything with a wooden spoon. Add flour gradually while stirring, just until the dough gathers in the center of the bowl, forming a soft, shaggy mass. You may not need all of the flour.
Turn the dough over on a lightly floured surface. Knead until the dough is smooth, elastic and can stretch thinly. Add flour sparingly as needed to help when the dough sticks too much to the board or your hands. Shape it into a ball and place it in a bowl. Cover the bowl with a kitchen towel and let rise for 1 to 1 and 1/2 hours, or until the size is doubled.
Gently deflate the dough and divide to 14 portions. Shape each portion into a smooth ball and arrange them on two greased 9 inched baking pan, spacing them evenly.
Cover the pans loosely with a kitchen towel and let the dough rise once more, for about an hour or until the size has doubled. Preheat oven to 350 F. Beat one egg and brush the surface of the rolls.
Bake the pan de siosa for 18-22 minutes at 350 F or until the buns are lightly golden. Brush the surface with melted butter, sprinkle with sugar and top with the shredded cheese.