Soak the rice in water for at least 3 hours or overnight.

Drain the rice and place it in a blender with 5 cups of fresh water.

Blend until the rice is finely ground, about 1-2 minutes.

Strain the mixture through a fine mesh strainer or cheesecloth into a large bowl, discarding the solids.

Stir in the milk, sugar, vanilla extract, ground cinnamon, and salt until well combined.

Chill in the refrigerator for at least 1 hour before serving.

Serve over ice and garnish with a sprinkle of cinnamon.