In the bowl of a stand mixer, combine eggs, oil, and lemon juice. In a large measuring cup, combine water, 1 tablespoon sugar, and yeast; let stand for 5 minutes, or until foamy. In a medium bowl, combine tapioca starch flour, brown rice flour, dry milk powder, xanthan gum, salt, and 3 tablespoons sugar. Add yeast mixture to the egg mixture, then slowly add dry ingredients a little at a time until completely incorporated. Mix batter on high speed for 31/2 minutes, then pour into prepared pan.