- Place the dates and half the cream or coconut milk into a blender, and blend at high speed for several minutes, or until the dates are very finely chopped. The liquid will begin to turn light brown when it's enough. It's crucial to get the dates well blended at this step, so take all the time you need.
- Add the remaining liquid and vanilla and blend for a few seconds.
- Place the ice cubes in a plastic bag or clean cotton towel and hit them with a mallet or heavy pan until they are crushed. Add the crushed ice cubes to the blender and blend on high speed for about 15 seconds. The ice cubes must be crushed before you put them in the blender or you will have chunks of ice in your shake.
- Pour into a glass and drink immediately.