From Deep Run Roots: Stories and Recipes from My Corner of the South
In a 1-quart container with a lid, stir together the milk, heavy cream and 1 1/2 cups of the peanuts. Tuck this in the refrigerator overnight. Roughly chop the remaining peanuts and set aside.
The next day, whisk together the egg yolks, salt, sugar and vanilla extract in a medium bowl. In a 2-quart saucepan, heat the heavy cream and peanut mixture to just under a boil. Slowly whisk half of this mixture into the yolks, taking care not to scramble them. Transfer the tempered yolks to the saucepan and, stirring the whole time, cook until the mixture thickens slightly and coats the back of the spoon.