Bring 4 cups of water to a boil. Add 8 Tadin Canelita tea bags to boiling water, cover and steep for 5 min. Remove bags and let tea cool to room temp (the freezer or fridge will help expedite this step).
While tea cools, rinse the rice and add it to a blender. Add 2 cups of cooled tea to blender and pulse to coarsely grind. Pour contents of the blender into a bowl and top with the remaining 2 cups of Canelita tea. Let sit at room temp for 3 hours.
After 3 hours, add rice mixture to blender and blend until smooth. Strain through a fine mesh sieve, stir in sugar and chill until cold. Before serving, stir well, pour over ice and garnish with a cinnamon stick.
WARNING: Consuming this product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/food