Split the vanilla bean lengthwise, scrape out the interior, and combine with the half-and-half in a saucepan. Add half of the sugar and bring to a simmer over medium heat.
In a mixing bowl, combine the egg yolks and the remaining sugar with about 1 cup of the simmering half-and-half and stir well to combine thoroughly. Add this egg yolk–half-and-half mix to the