This recipe goes with the Baked Alaska Bombe.
Combine milk, cream, vanilla, and 1/2 cup sugar in a medium saucepan. Bring mixture to a simmer, stirring. Whisk together egg yolks and remaining 1/2 cup sugar. Gradually whisk hot milk mixture into egg mixture.
Pour mixture into pan, and cook over medium heat, stirring constantly, until thick enough to coat the back of a spoon, about 4 minutes. Pour custard through a fine sieve into a bowl that has been set in a larger bowl of ice water. Let cool 10 minutes, stirring occasionally. Refrigerate custard until cold, about 1 hour.
Freeze in an ice cream maker according to manufacturer's directions, then transfer directly to bombe mold.