I’ve been juicing some ginger by grating it and pressing it (by hand). A white residue collects at the bottom of the liquid. What is this?
I believe that this white residue is starch. According to Wikipedia, Ginger is 17.7% carbohydrates by weight, or 14% excluding sugar and dietary fiber.
I let the residue settle and decanted the liquid. The residue behaved remarkably similarly to wet corn starch. From this, I have concluded that it is starch of some form.