Awesome Cognac Egg Nog

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Fuqua Estate in Richardson, Texas in 1994.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 1 egg yolk
 * 1 tablespoon sugar
 * 1 teaspoon vanilla
 * 2¼ cups cognac

Directions
Mix egg yolk, sugar and vanilla until light colored and creamy. Add cognac and stir until all is well blended.