This is great paired with poached Seckel pears dipped in caramel.
Preheat oven to 350 degrees. Butter square pan or 3-inch oval molds and set aside. Combine water with baking soda. Set aside. In a large bowl, sift together flour, spices, and baking powder. Set aside.
In another large bowl, cream butter. Add sugar and beat until fluffy. Beat in molasses and baking-soda mixture. Beat in flour mixture. Add eggs and beat well.
Pour batter into pan and bake 35 to 40 minutes for square pan, 25 to 30 minutes for molds (a toothpick inserted into center should come out clean). Cool on wire rack. To serve, dust with confectioners' sugar and top with whipped cream and a slice of Candied Ginger.