Step 2
Dissolve 1/2 teaspoon of sugar in the warm water in a 1-cup measuring cup, and sprinkle with the yeast. Stir to mix the yeast into the water, and let stand in a warm place until frothy and doubled in volume, 10 to 15 minutes. Stir together 1/3 cup of sugar, 2 raw eggs, salt, the yeast mixture, milk, and 3 cups of flour in a large bowl, and beat with an electric mixer for 3 minutes to develop gluten. Mix the remaining flour into the batter, and beat until the dough is shiny, soft, and elastic, about 5 minutes. Scrape down the bowl, cover with plastic wrap, and refrigerate for 30 minutes.