Classic vanilla ice cream is made with a cooked egg-yolk custard base that gives the finished scoop a rich, creamy consistency. Whole vanilla beans or a good-quality extract provide the flavor. Plan for about 30 minutes on the stove, then churning time and several hours in the freezer before it's ready to serve.
In a medium saucepan, combine 2 cups of heavy cream, 1 cup of whole milk, and 3/4 cup of granulated sugar. Add the vanilla bean seeds and the pod. Warm over medium heat until the edges start to bubble gently, stirring occasionally.
In a separate mixing bowl, whisk the 4 large egg yolks. Gradually pour a third of the warm cream mixture into the yolks while whisking constantly to temper.
Return the yolks and cream mixture back to the saucepan. Cook over low heat, stirring continuously with a spatula, until the mixture thickens and coats the back of the spoon. It should reach about 170°F (77°C).
Strain the custard through a fine-mesh strainer into a clean bowl. Stir in 1 teaspoon of pure vanilla extract. Discard the vanilla pod.
Chill the custard in the refrigerator for at least 4 hours or overnight until thoroughly cold. Once chilled, churn in your ice cream maker according to manufacturer’s instructions.
Transfer the churned ice cream to an airtight container and freeze for at least 2 hours before serving for a more solid consistency.
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Notes
For a richer flavor, consider infusing the mixture with additional vanilla pods.
If you don't have an ice cream maker, pour the mixture into a shallow dish, freeze, and stir every 30 minutes until set.