Tapioca flour as xanthan gum substitute (egg sub, too)

Here is the link where I found this info: freerangecookies.com

In her words:

In a microwave safe bowl, combine:

1 teaspoon tapioca starch
1/3 cup water

Heat for 30 seconds at full power in the microwave. Stir. Heat for another 15 seconds. Let gel cool slightly before continuing. Feels just like an egg, doesn’t it? It’s tapioca gel.

She has more info on working with this mix on her site. I'm adding this to my list of xanthan gum substitutes.