I got this receipe from Anna Olson's Sugar on Food Network Canada. I was a bit dubious about putting fresh ginger in the cake - but it gives these cakes absolutely wonderful fresh taste, like nothing else I've ever tasted. For tea-lovers, this cake is a must - it's best if you can find some matcha powder - it also gives the cake wonderful green colour. But if you can't find any matcha you can use green tea leaves - infuse them with the orange zest and strain.