Vanilla Sauce

Bring milk and vanilla bean almost to a simmer in a small heavy saucepan over low heat. Remove from heat, cover and let steep for 30 minutes. Whisk eggs, sugar and salt in a mixing bowl until well combined. Reheat milk over low heat until steaming. Gradually add to egg mixture, whisking constantly. Return mixture to the saucepan. Cook over low heat, stirring constantly, until thick enough to coat the back of a metal spoon, 7 to 8 minutes. Do not let sauce come to a simmer. Pour sauce through a fine-mesh sieve into a clean bowl. Scrape seeds from vanilla bean and stir them into sauce. Cover surface with plastic wrap and refrigerate until chilled, about 2 hours.