Heat the Cream Base
In a medium saucepan over medium heat, combine the heavy cream, milk, half the sugar, nutmeg, cinnamon, and salt. Stir gently and heat until the mixture is steaming but not boiling. You want it hot—not angry.
Whisk the Egg Yolks
While that’s warming up, whisk the egg yolks and remaining sugar in a bowl until pale and slightly thickened. This step gives your ice cream that classic custard richness.
Temper the Eggs
Slowly pour about ½ cup of the hot cream mixture into the egg yolks while whisking constantly. This prevents scrambling and gently warms the eggs. Then pour the egg mixture back into the saucepan.
Cook Until Thickened
Return the saucepan to medium-low heat. Stir constantly with a spatula or whisk until the custard thickens enough to coat the back of a spoon (about 170–175°F). Do not boil.
Strain & Add Flavor
Strain the custard through a fine-mesh sieve into a clean bowl. Stir in the vanilla extract and rum (if using).
Chill Thoroughly
Cover and refrigerate for at least 4 hours, preferably overnight. Cold base = creamy ice cream.
Churn It
Pour the chilled custard into your ice cream maker and churn according to manufacturer instructions (usually 20–25 minutes).
Freeze to Set
Transfer to an airtight container and freeze for 2–4 hours until scoopable.
Now the hardest part: waiting.