In a covered 12-quart stockpot, bring water to a boil. Add nutmeg, allspice, ginger, cloves, mace and cinnamon. Reduce heat and simmer for 5 minutes. Add sugar and sherry and heat until the sugar dissolves completely.
Beat the egg yolks and whites separately; fold together. Put egg mixture in a large bowl, and slowly add the heated mixture to the eggs, 1/4 cup at a time at first, stirring each addition to slowly heat the eggs. Once the brew has been thoroughly mixed, add the brandy and the baked apples.
I keep my Wassail in a large crock pot on low heat to prevent the eggs from curdling. If you don’t have a crock pot, keep it on the stove on low, but be very careful: even on low heat this mixture will get hot – quickly. Enjoy and have a great new years.