Ground from the cousin of our horseradish and called wasabi root in Japan, it is mixed with cold water just like mustard. Although its main use is as a condiment for sushi (delicious), it is also brilliant mixed into creamed horseradish to give it back its kick. Just use a ΒΌ teaspoon of wasabi powder to 2 tablespoons of creamed horseradish.
If you have problems tracking down wasabi and other Japanese ingredients, try www.clearspring.co.uk
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