Add the 6 whole eggs to a blender and blend on low speed.
Add 5 oz of rum (2.5 oz Apple Estate and 2.5 oz Chairman's Reserve), 4.5 oz of Amontillado sherry, and 1 oz of allspice dram.
Add 225 g (about 1 ¼ cups) of sugar.
Slowly add 18 oz of whole milk and 12 oz of heavy cream.
Add 4 oz of OFTD overproof rum.
Add 1 tsp of vanilla paste (or ½ a vanilla bean), 1 tsp of vanilla extract, 1 tsp of freshly grated nutmeg, and 1 tsp of freshly grated cinnamon.
Blend on low to combine the spices.
Strain the eggnog through a fine mesh strainer to remove any large spice pieces or stringy egg bits.
Chill the eggnog and let the flavors meld for about a week before serving.
