Making tapioca flour

[highchef]

There is a blueberry pie recipe I want to try (Alton brown) that calls for tapioca flour. I cannot find it in this town, even in the Bob's Red Mill section, and I know they make it. There are 2 results from google, one is a white flour, cornstarch,tapioca pearl mix and the other just grinds the tapioca in a grinder. That's a big difference,and I suspect the results would differ in taste and texture. Could someone help me out? What does your tapioca flour have in it? Thanks so much!

[deensiebat]

Try Asian markets -- they usually have it in small bags, and it's dirt cheap.

[highchef]

Thanks,I should have thought of that! That's where I found the rice flour last year for my shortbread!

[stuartlikesstrudel]

I would think that tapioca flour definitely shouldn't have wheat and corn flours in it. I guess that recipe must have been a blend for something, maybe if you're trying to approximate the effect of it as a substitute.