1 Beat egg yolks, then add sugar: In a large bowl, use a whisk or an electric mixer to beat egg yolks until they become somewhat lighter in color. Slowly add the sugar, beating after each addition. Beat at high speed or whisk until fluffy.
2 Heat milk with cinnamon and cloves: Combine the milk, cloves, and cinnamon in a thick-bottomed saucepan. Slowly heat on medium heat until the milk mixture is steamy hot, but not boiling.
3 Temper the eggs: Add the eggs by slowly adding half of the hot milk mixture into the eggs, whisking constantly while you add the hot mixture. Pour the mixture back into the saucepan.
4 Cook until eggnog thickens: Cook the eggnog on medium heat, stirring constantly with a wooden spoon, until the mixture begins to thicken slightly, and coats the back of the spoon. It helps to have a candy thermometer, but not necessary; if you have one, cook until the…