I found this recipe. It is not exactly like Mackenzie’s, but you could tweak it by substituting Madiera for the sherry and finish it with whipped cream.
Wine Cake
1 package yellow cake mix
1 package instant vanilla pudding
1 tablespoon nutmeg
1 cup wine, sherry or port
4 eggs
3/4 cup vegetable oil
Directions:
Mix the above ingredients well and pour into a greased bundt or tube pan. Bake in a pre-heated 350 degree oven for 40-45 minutes. Cool and sprinkle with powdered sugar or drizzle with mixture of 1/2 cup powdered sugar and 3 teaspoons milk.