Whisk together milk, salt, sugar in a small pot and warm through.
In the meantime, beat egg yolks in a small bowl; add a small amount of the warmed dairy mixture, whisking gently.
Add the egg mixture to the pot and heat until custard thickens.
Strain mixture into medium size bowl (strainer will catch any scrambled egg bits) and add cream and vanilla; chill completely.
About 30 minutes before you're ready to turn on your ice cream maker, combine berries, vodka and sugar (if using) in a small bowl.
Toss with fork or bliz with an immersion blender until combined; strain seeds if desired.