A pressure cooker is not only good for cooking large cuts of meat and beans in a fraction of the time they would usually take. Add the hot cream mixture to the beaten eggs slowly and whisk constantly to ensure no bits of yolk coagulate. And, when adding the chocolate, continue to whisk steadily but gently, or you will create foam that can result in an uneven surface when the mixture sets. In a saucepan over low heat, combine the cream and milk and bring to a simmer. Whisk the hot cream mixture into the egg yolk mixture until combined.