Mea culpa. I forgot to post my favorite egg nog recipe before the holidays. A fellow grad student friend gave it to me many years ago and, other than a few tweaks I continue the tradition.

Coquito, aka Puerto Rican egg nog

2 cans cream of coconut
2 cans condensed or evaporated milk, your preference
4 egg yolks
1 tablespoon good quality vanilla
1 bottle good quality dark rum [I prefer Goslings or Don Q.]
Cinnamon, to taste
Nutmeg
Lemon zest

Combine all of the wet ingredients, mixing thoroughly.
Just before serving it up, put the dry ingredients on the mixture in the bowl.