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Hi,
I just want to share my experience with a great product I came across
accidently several years ago. It's called "Swan" Potato Starch Flour (blue
box). I get it in the flour section of Safeway (large chain grocery store in
western US) and I also saw it in a large grocery chain in New England this
winter (can't remember which store).
It makes a great white sauce and also is terrific as a thickener for soups,
stews, etc. It's really easy, too.
Jane (CA)