Step 1.
- In a mixing bowl, whisk together the egg yolks and sugar until pale and creamy.
Step 2.
- Slowly add in the milk, heavy cream, and Irish cream, stirring to combine.
Step 3.
- In a separate bowl, beat the egg whites until stiff peaks form, then gently fold into the egg yolk mixture.
Step 4.
- Chill the mixture for at least 1 hour to enhance flavors.
Step 5.
- Serve in a chilled highball glass and garnish with a sprinkle of nutmeg.