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just found this website..it has food substitutions and descriptions, from
their website:

The Cook's Thesaurus is a cooking encyclopedia that covers thousands of
ingredients and kitchen tools.  Entries include pictures, descriptions,
synonyms, pronunciations, and suggested substitutions.

it's not a g-f site but still looks very usefull as it includes g-f
products.

the site is http://www.foodsubs.com

Tam