-
heat 1 cup half and half until bubbling.
-
whisk in 1/2 cup sugar and coffee.
-
remove from heat and whisk into eggs in a small, stead stream.
-
add 1 cup of half and half, 1/2 cup sugar, vanilla and salt.
-
heat whisking constantly until thick- about 5 minutes over medium heat.
-
pour mixture into a bowl and refrigerate until cold covered with plastic wrap (right on the custard to prevent a skin).
-
whisk in final 2 cups of half and half and freeze according to manufactures instructions (about 30 minutes for me).