What is the proper way to make green tea ice cream without an ice cream maker?

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http://japanesefood.about.com/od/japanes鈥?/a>What is the proper way to make green tea ice cream without an ice cream maker?
Green Tea Ice Cream





Ingredients


1 pint vanilla ice cream or soy ice cream


1 1/2 teaspoons green tea powder, matcha


Directions


1Let the ice cream soften but not melt. Stir in the green tea powder ';matcha'; and refreeze until firm.


2Matcha is sold in the tea section of Asian markets.