In a bowl, dissolve Active Dry Yeast (20 gram) and Granulated Sugar (1 tablespoon) into the Kefir Whey (100 milliliter), then stir in a part of the Bread Flour (130 gram).
Cover dough with plastic wrap and place it into your oven for about 1 hour, or until it doubles in size.
Add in the rest of the Bread Flour (400 gram), Soy Milk (250 milliliter), Vegetable Oil (60 milliliter) and Salt (2 1/2 teaspoon). Knead for 10 minutes, or until you get a smooth and soft dough.
Cover bowl with plastic wrap, then place it in your oven and let it rest for about 2 hours, or until it doubles in size.
On a floured surface, roll out the dough into a rectangular shape. Stuff it with whatever you fancy. Roll up the dough and seal it into a circle. Cover with plastic wrap and let it rest for an extra 40 minutes. It will grow a bit.
Preheat oven to 375 degrees F (180 degrees C).
Brush the top with additional Soy Milk (to taste). Bake for about 50 minutes.
Allow bread to cool.
Slice, serve, and enjoy!