In a high-speed blender, combine the coffee, 3 dates, hemp hearts, and nut butter. Blend until very smooth. Taste the mixture, and add an extra date if you'd like it to be sweeter.
Add the ice cubes and blend again, until the smoothie has a slushy texture. Serve right away for the best consistency.
Nutrition information is for the whole batch. This is just an estimate, and not a guarantee. This recipe works best with soft, squishy dates. If you can only find dry ones from a bulk bin, I recommend soaking them in hot water for 10- 15 minutes before blending.As an alternative, you can replace the dates with 1 frozen banana + 1 tablespoon of maple syrup. In that case, you may need to use a few less ice cubes to achieve a slushy texture.