- 2 cups low-fat (1%) milk
- 1 3-inch piece vanilla bean, split lengthwise
- 1/4 cup sugar
- 2 teaspoons cornstarch
- 1 large egg
- Pour milk into heavy medium saucepan. Scrape in seeds from vanilla bean; add bean. Bring to simmer. Whisk sugar and cornstarch in medium bowl until no lumps remain. Add egg; whisk until well blended. Gradually whisk hot milk mixture into egg mixture. Return to same saucepan; whisk over medium heat until sauce thickens and boils, about 5 minutes. Pour into another medium bowl. Chill until cold, stirring occasionally, about 4 hours. (Can be made 2 days ahead. Cover and keep chilled. Before serving, remove vanilla bean and whisk to loosen.)