Cream the butter and sugar together in the bowl of an electric mixer until light and fluffy. Beat in eggs one at a time, making sure each is incorporated before adding next.
Sift flour and baking powder together in a separate bowl and alternately add flour mixture to the butter mixture with the orange juice.
Stir in grated zests and turn the batter into a well buttered 1 quart steamed pudding mold and cover tightly with a lid or a double layer of foil secured with kitchen string. Set the mold on a rack in a kettle with a tight fitting lid and add enough hot water to kettle to reach 2/3 of the way up the sides of the mold. Steam the pudding covered for 2 hours.
Remove and let pudding cool a bit on a rack for 10 minutes, uncovered. Meanwhile, MAKE THE RUM BUTTER: With an electric mixer with a whip attachment, cream butter. Beat in sugar a little at a time and then beat in rum, zest and nutmeg. Beat until light and fluffy and transfer to a serving bowl. Place a serving plate on top of the pudding and invert onto a serving plate and serve with the rum butter.
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Orange Steamed English Pudding With Rum Butter (cont.)