1. Combine the rice and 2 1/2 cups steaming hot water in a large bowl. Soak at room temperature for 2 hours. Alternately, you can use room temp water and soak for 8 hours or overnight.

2. Pour the rice and water into a blender. Blend until creamy, 2 to 3 minutes. Add the honey or maple syrup, vanilla, nutmeg, cinnamon, and a pinch of salt. Blend until combined. Pour the mixture into a large pitcher or jar. Add the milk and stir to combine. Chill until ready to serve. Stir well before serving.

3. To serve, rim each glass with cinnamon sugar, if desired. Fill glasses with ice. Add the horchata, then pour over the coffee, using an amount to your liking. Add the Kahlua, if using, and stir to combine. Sprinkle with cinnamon. Enjoy!

Recipe Notes:
 the Horchata base will keep in the fridge for up to 5 days.
Straining: If a smoother consistency is desired, you can strain the horchata through a cheesecloth lined sieve, then chill. I personally do not find the need to do this.
Dirty Horchata by Half Baked Harvest