Pan de Agua

Ingredients:
1 pack of active yeast
1 tbsp. of sugar
2 cups of warm water
1 tbsp. of salt
15 cups of flour
3 tsp. of corn flour (fine)
2 tbsp.of egg whites
2 tbsp. of cold water
Preparation:
In a bowl, mix the yeast, sugar and warm water and cover for about 20 minutes. Mix the salt and the flour and cup by cup add to the yeast. Knead for about 10 minutes or when it stops being sticky and form into a big ball. (You can add 1 more tablespoon of flour if needed.) Spread some butter all around a big bowl and place the ball in the bowl. Cover it well and let it rise for 1 to 1/2 hours. On a working area, sprinkle flour (cover your hands with flour too) and put the ball on the surface on top of the flour. Knead the bread to form two long loaves of bread.Sprinkle some corn flour on top of a baking board and place the two loaves of bread.(You may use an aluminum mold but grease it well.) Mix the cold water and eggs whites well and set aside. Make 2 or 3 slashes on top of the loaves with a sharp knife and with a brush, spread some of the egg white mix on top of the loaves. Place the 2 loaves of bread into a cold oven.Now, turn the oven on to 400º F and let it bake for 35 minutes