I am going to try the following two recipes and see which one is better:

NO YOLKS:

2 cups heavy cream 
1 cup whole milk 
3/4 cup sugar 
1/4 teaspoon fine sea salt 
1 tablespoon vanilla extract or 1 vanilla bean split in half lengthwise 

WITH YOLKS:

2 cups heavy cream 
1 cup whole milk 
3/4 cup sugar 
1/4 teaspoon fine sea salt 
1 tablespoon vanilla extract or 1 vanilla bean split in half lengthwise 
6 large egg yolks