Old Fashioned Drinking Custard

half and half (or use a 50/50 mixture of heavy cream , whole milk, and/or half and half)

granulated sugar

all purpose flour

egg yolks , reserve egg whites

overflowing teaspoon of vanilla, almond, or rum extract , or to taste

Whipped cream , to garnish

Freshly grated nutmeg , to garnish

to 1 ounce bourbon or rum, per mug, or to taste, optional