Grease and flour a 9-inch tube pan. I used 4 1/2-inch diameter spring forms.
Combine the melted butter, egg and sugar in a mixer fitted with a paddle attachment,. Add the molasses and water and mix.
Sift the flour, baking soda, salt, ginger, and cinnamon together. Working in batches, and mixing after each addition, add the dry ingredients to the molasses mixture. Mix until smooth. Fold in walnuts.
Pour into the prepared pan and bake in the center of the oven for about 35 minutes (the same amount of time is needed for the mini). Let cool in pan for 10 minutes, then turn out on to a wire rack.