Soak rice in 2 cups very hot (not boiling water) for 2 hours (amount as original recipe is written // use 1/3 of the total water if altering batch size). The rice should be soft but still very raw - you should be able to snap a piece in half with your fingernail without much effort. Drain and add to a blender.
Add 4 cups water (amount as original recipe is written // use 2/3 of the total water if altering batch size), dates, vanilla, and the cinnamon stick, top with lid and cover with a towel to ensure it doesn't splash. Blend for about 1 minute until the date specks are very small and the mixture seems well combined. It doesn't have to be 100% pulverized.
*You can sub 1/2 tsp ground cinnamon for the 1 cinnamon stick.
*Nutrition is a rough estimate.