Warm the milk, sugar, 1 cup of the cream and salt in a saucepan.
Pour the remaining cream into a large bowl and set a sieve on top
Then in another bowl, whisk the egg yolks.
Pour the warm cream/milk mixture slowly add that to the eggs while whisking the whole time! (If you don't, you will be making scrambled eggs!
Once mixed, add that back to saucepan.
Stir the mixture constantly over medium heat with a heatproof spatula, scraping the bottom as you stir, until the mixture thickens and coats the spatula.
When it reaches 170° and it begins to coat the back of the spatula, you can then pour it through the strainer into the other bowl with the cream in it.
Stir until cool over an ice bath
Chill the mixture thoroughly in the fridge
When ready to freeze, drain the raisins over a bowl and reserve the rum
Stir the rum into the mixture - I added it all, but do it to taste
Freeze the ice cream according to the manufacturer's instructions.
During the last few minutes of churning, add the rum soaked raisins