3/4 cup packed dark brown sugar
1 stick butter or margarine, softened
2 large eggs
1/4 cup molasses
3 3/4 cups all-purpose flour, plus more for dusting work surface
2 teaspoons ground ginger
1 1/2 teaspoons baking soda
1/2 teaspoon ground cinnamon
1/2 teaspoon freshly grated nutmeg
1/2 teaspoon salt
1 cup confectioners' sugar, sifted
1 to 2 tablespoons milk
Food coloring, as desired