Preparation In medium bowl, whisk together 1/2 cup milk, egg yolks, 1/3 cup sugar, and cornstarch. Transfer remaining 1 3/4 cups milk to heavy medium saucepan. Scrape in seeds from vanilla bean; add pod. Sprinkle remaining 1/3 cup sugar over, letting sugar sink undisturbed to bottom. Set pan over moderate heat and bring to simmer without stirring. Whisk hot milk mixture, then gradually whisk into egg yolk mixture. Return to saucepan over moderate heat and cook, whisking constantly, until pastry cream simmers and thickens, about 1 minute. Remove from heat, discard vanilla pod, and whisk cream until smooth. Transfer to bowl and press plastic wrap directly onto surface. Chill until cold, about 4 hours. (Pastry cream can be made ahead and refrigerated, wrapped well with plastic wrap on surface, up to 3 days.)
Preparation In medium bowl, whisk together 1/2 cup milk, egg yolks, 1/3 cup sugar, and cornstarch. Transfer remaining 1 3/4 cups milk to heavy medium saucepan. Scrape in seeds from vanilla bean; add pod. Sprinkle remaining 1/3 cup sugar over, letting sugar sink undisturbed to bottom. Set pan over moderate heat and bring to simmer without stirring. Whisk hot milk mixture, then gradually whisk into egg yolk mixture. Return to saucepan over moderate heat and cook, whisking constantly, until pastry cream simmers and thickens, about 1 minute. Remove from heat, discard vanilla pod, and whisk cream until smooth. Transfer to bowl and press plastic wrap directly onto surface. Chill until cold, about 4 hours. (Pastry cream can be made ahead and refrigerated, wrapped well with plastic wrap on surface, up to 3 days.)