Combine the yeast, 1 tablespoon of the sugar and 1/4 cup of the water in a large bowl and let stand until foamy, 5 to 10 minutes. Stir in the remaining sugar, the remaining water, the egg, milk, and salt. Add 4 cups of the flour and stir to form a dough that is soft and pliable, but not sticky. Knead the dough until smooth and elastic either by hand on a floured work surface, in a food processor, or a in mixer fitted with the dough hook; add more flour, if necessary. It should take 6 to 8 minutes.