• Mix all the ingredients, except the vanilla and alcohol, together in a blender and mix until smooth.
• Pour into a saucepan and bring to a boil. Once boiling, remove from the heat and whisk until smooth and thickened.
• Stir in the vanilla and alcohol.
• Pour into a container and chill overnight.

Instructions for using an ice cream maker

• Once the mixture is chilled, you simply add it to your ice cream maker, following the manufacturer's instructions. Once churned, add to a shallow, freezer-safe container and freeze for at least 3 hours.

Instructions without using an ice cream maker

• If you have a stand mixer with a metal bowl, you can freeze the bowl overnight and "churn" the ice cream using the paddle attachment.
• Otherwise, you will need to whisk the mixture well before freezing it and repeat every hour or so it does not become icy.