Place the cocoa nibs into a coffee/spice grinder. Pulse several times. Doesn't need to be a fine powder, the nibs will still be somewhat coarse.
Mix the cocoa nibs with the whole milk. Place into the microwave and heat on high fr 3-4 minutes until the milk is around 160 degrees. Don't let it boil over.
Allow to steep for 30 minutes before proceeding.
In a clean French press, combine the chopped bittersweet chocolate, sugar, water, and salt.
After the 30 minutes is up, return the milk/nib mixture to the microwave and heat on high for 2 minutes. The milk should be around 185 degrees.
Strain the mixture through a fine mesh strainer, before adding to the French Press.
Pump the French Press about 15 times to aerate. Best served immediately, once it's not too hot to drink.