In a small bowl, pour boiling water over dates and set aside to cool. Preheat oven to 170 degrees C. Grease a 25x25cm baking pan.
In a medium bowl, cream together the copha and white sugar. Add eggs, one at a time, beating after each addition. Add the dates, including any water; mix well. Sift together the flour, cinnamon, nutmeg and bicarb soda; stir into the date mixture. Then stir in the nuts.
Spread the mixture evenly into the prepared pan and bake for 45 minutes in the preheated oven. When cool, cut into bars and roll each bar in icing sugar.