Step 1.
- In a bowl, combine 2 egg whites and beat until frothy.
Step 2.
- In a separate bowl, mix together 2 egg yolks, 1/4 cup sugar, 1 teaspoon vanilla extract, and a pinch of salt until well combined.
Step 3.
- Gradually fold the beaten egg whites into the mixture to create a batter.
Step 4.
- Stir in 1 cup of dark rum and 1/2 teaspoon of ground cinnamon.
Step 5.
- To serve, fill a mug halfway with hot milk or water.
Step 6.
- Spoon the batter on top, filling the mug nearly to the brim, then stir gently.
Step 7.
- Garnish with a sprinkle of ground nutmeg and a cinnamon stick before serving.