Add the pineapple peels, the rice, and the cinnamon stick in our large pot.
Fill with water to cover the ingredients, approximately 1.5 liters of water.
Simmer for 30 minutes over medium-low heat, or until the rice has been cooked. You will see the rice grain swells a lot due to the amount of water.
Once the rice is done, turn off the heat and remove the pineapple peels and the cinnamon stick.
Transfer the ingredients (rice and the liquid) from the pot into a blender.
Add the evaporated milk, sugar, cinnamon, vanilla, and a cup of water.
Blend the mixture, be careful since it’s hot. If it is too thick, you can add more water to dilute. Adjust the sugar to taste if necessary, it should taste sweet, but not overpowering like candy.
Store in the blender in the fridge to chill or serve with a lot of ice and enjoy!