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You don't need to buy one...this is soooooooo easy to make.
Got this recipe from the Grand Hotel in Tawain

In a sauce pan, pring
12 cup sugar
1/2 cup water
2 slices fresh ginger
Bring to a boil  and cook until sugar dissolves

Add 1/4 cup gf ketchup.

Make a slurry of 2 tablesppons cornstarch -or arrowroot- and 1/2 cup
cold water ....mix well and slowly pour into boilling liquid, Stir and
cook until thickened.  If desired 2 tablespoon s dry sherry or Chinese
wine may be added before the conrstarch.
Cooked strips of carrots, & peppers may be added to the suace before
pouring

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