Start by separating the egg yolks and whites into two clean, dry bowls. Beat the egg whites with cream of tartar using an electric mixer on high speed for about 4-5 minutes, or until you achieve stiff peaks.

In the other bowl, mix the egg yolks, granulated sugar, and softened butter until well combined, approximately 2-3 minutes. Add in the vanilla extract, ground spices, and rum, blending smoothly.

Gently fold in the beaten egg whites without deflating them, then refrigerate the batter until you are ready to serve.

In a small saucepan, gently heat 4 cups of milk over medium-low heat, stirring occasionally to prevent scorching, until it’s steaming—about 5 minutes.

For each serving, take your warmed mug and add 1 heaping tablespoon of the chilled batter. Pour in 1 ounce of rum and 4 ounces of hot milk, stirring gently with a spoon until the mixture is frothy and well combined.

Finally, sprinkle a pinch of ground nutmeg over the top for that classic holiday touch. Serve your Tom And Jerry drink immediately while still warm.