Chinese keys or gra-chai as the Thais know it, has a misleading
name that makes it sound like it originated from China. As far as I know, gra-chai is not used in
Chinese cooking. Gra-chai roots are used to tame fishiness or meat odor. It also enhances the
flavor of fish dishes. The brown skin is scraped away before use.
Gra-chai is available
frozen, dried and powder. I get mine frozen and thaw it before use. Frozen is as good as
fresh.
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