Cut the pineapple into medium cubes on a cutting board, removing the skin completely. Reserve half a cup of the chopped pineapple and blend the rest with the water and cornstarch until fully integrated. Set aside.
Add the half cup of pineapple you reserved in a pot along with the rest of the water, the sugar, and a cinnamon stick. Cook until the liquid boils, stirring occasionally.
Once the liquid starts to boil, pour in the blended mixture through a strainer. Incorporate and cook over medium-low heat until the liquid boils and thickens slightly.
Serve the pineapple atole hot accompanied by a cinnamon stick and enjoy!
