Wash and dry the mulberries. Cut off the excess stem if you wish.
Add the mulberries, salt and vanilla extract to a blender and puree until smooth. This puree can be strained to remove the seeds and excess stem if you wish.
Add the caster sugar and the cream to the blender if it will fit and blend until combined.
Add the milk to the blender and blend through.
If the mixture doesn't fit in your blender, add it all to a large bowl and mix until the sugar is dissolved.
Pour the mixture into an ice cream maker and churn according to the manufacturer's instructions until thick and creamy.
Transfer to a large container and freeze for at least 4 hours until firm.
If you don't have an ice cream maker, then pour the mixture into a freezer-safe container and freeze the mixture until it sets. I like to take it out and beat it again in the stand mixer and let it set again before using as this helps make it extra creamy, though you don't have to do this.
Remove the ice cream from the freezer about 5 minutes before serving to allow it to soften for easier scooping.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.