Grease a 1 ½-pint pudding basin with melted butter and set aside.Heat the butter with the milk until melted and let it cool to tepid.Stir in the sour cream.With a whisk, add the egg and Light Brown Muscovado sugar until smooth.Sift together the dry ingredients.Make a will in the center of the flour mixture and pour in the liquid, stirring until the mixture is smooth.Add the stem ginger.Put the mixture into the pudding basin and cover with two layers of buttered greaseproof paper and secure with string.Steam for 1 ½ hours.
Source : The Best of Billington’s Recipe Collection