I've been noticing more and more of this 'fresh blended soy milk' being sold as a snack. Cooked soybeans are blended whole with hot water and additions. The menu lists the health benefits of each type of soy milk - you can add red, black, and green beans, peanuts, oatmeal, mountain yam, lotus seeds, dates, goji berries, sesame seeds, and corn, in various combinations. Sugar is usually added, but I tell the vendor not to bother.
Big blender and additions:
Closer look at the additions:
Menu with formulas and health benefits:
Location: Yulin Dong Lu 玉林东路