Dissolve the ½ oz of sugar in the warm water. Sprinkle the yeast over the water and let it stand for a few minutes, then stir. Let the mixture sit in a warm space for 10 minutes until the yeast begins to bloom (foam). Meanwhile, put the flour on a clean work surface and make a well in the center. Put the shortening, sugar, milk and yeast mixture in the well and start to stir to combine with the flour, gradually incorporating the flour. Knead the dough for 10 minutes – adding a little flour as needed if the dough is too sticky. Alternatively you can use a stand mixer with a dough hook and mix until the dough is smooth.
½ oz sugar, 2 oz warm water (105°F), ¼ oz active dry yeast, 16 oz all purpose Flour, 1 oz vegetable shortening, 4 oz sugar, 8 oz warm whole milk (105°F)
Oil a bowl and place the dough in the bowl, oiling the dough ball as well. Cover with plastic wrap and let rest in a warm place for 90 minutes or until the dough has doubled in size. If you didn't make the filling and dipping sauce in advance, make it while the dough rests.
½ oz vegetable oil
Remove the dough from the bowl and place on a clean work surface. Punch the dough down and flatten it to ¾ inch. Spread the baking powder/water mixture evenly on top of the flattened dough, then pinch off a small golf ball size piece and set aside.
1 tablespoon baking powder mixed with ¾ oz water
Place the dough back in two separate bowls. Add the orange food coloring to the larger segment of dough and the green food coloring to the smaller segment of dough, then fold the dough over several times and begin to knead the dough. (Using a bowl for this step instead of kneading on a flat surface will prevent the dye from staining your countertops.)
⅛ teaspoon orange food coloring for pumpkins, a few drops green food coloring for stems/vines
Knead for about 10-15 minutes until firm and smooth. Cover, and let rest for 30 more minutes.
Remove the dough from the bowl and begin making the bao.