Tom Yum Paste
Pes Tom Yam

Commercial tom yum paste is made by crushing all the herb ingredients and stir-frying in oil. Seasoning and other preservative ingredients are then added. The paste is bottled or packaged, and sold around the world. Tom yum flavored with the paste may have different characteristics to that made with fresh herb ingredients.

http://en.wikipedia.org/wiki/Tom_yum
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