Yield
Makes about 2 cups

How to Make It

Step 1

Beat together egg yolks and sugar in a medium bowl until very thick and pale, about 3 minutes.

Step 2

Pour cream into a heavy, medium saucepan. Scrape seeds from vanilla bean with the point of a small knife, and add seeds and pod halves to cream. Bring cream to a simmer over medium heat; remove from heat as soon as bubbles begin to form around edge of saucepan.

Step 3

Slowly whisk hot cream mixture into yolk mixture. Return mixture to saucepan, and heat over medium-low heat. Stir constantly with a wooden spoon, making sure to stir over the entire bottom of the pan and into the corners, until sauce thickens enough to coat the back of the spoon, about 3 minutes. When done, a track drawn through the custard on the back of the spoon will not close.

Step 4

Stir in buttermilk. Remove vanilla bean. Serve warm, or place pan in a large ice-filled bowl for 25 minutes or until mixture cools to room temperature, stirring occasionally; refrigerate until cold. The sauce can be made 1 day ahead.

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