To make milk ice cubes: Pour 1 1/2 to 2 cups milk (your choice) into a standard ice cube tray and freeze. A standard tray will make about 3 cups of cubes. Keeping cubes on hand in a freezer bag saves time for future shakes.
To make shake: Pour half of beer into the Vitamix container and add the cream, vanilla, sugar, cocoa and milk ice cubes. Secure the lid, remove the lid plug and insert the tamper.
With the switch on Variable, select speed 1 and turn on the machine. Gradually increase the speed to 10, then flip the switch to High and, using the tamper to push the ice cubes into the blades, blend for 30 to 60 seconds or until thick and smooth. Turn the machine off. If you hear ice cubes hitting the blades as they fall to the bottom, pulse again.
Pour into 2 large glasses, then pour the remaining beer down the side of each glass, dividing equally. Serve immediately.
Nutrition information per serving: