Place all the ingredients in a medium saucepan, and whisk to combine.
1 cup water, ¾ cup dark brown sugar, 1 to 4 tablespoons unsulphured molasses, 1 ½ teaspoons ground ginger, ½ teaspoon ground cinnamon, ¼ teaspoon ground nutmeg, ⅛ teaspoon ground allspice, ⅛ teaspoon ground cloves, 1 teaspoon vanilla extract