Notes: Horchata tastes best after it sits for a day or two when the cinnamon oils are fully infused and the uncooked rice begins to lose its chalky taste. Make it with brown rice and raw agave nectar for a healthier and nuttier tasting version (just be sure to soak it an extra day or two). A note on the inclusion of milk: I've had horchata with and without milk in it, in both the US and Mexico. People here in Texas tend to put tons of milk in their horchata and I find it too rich to be refreshing on a hot summer's day. I add a cup of goat milk to give it body but that can be left out. As for the vanilla, I am a fan of Mexican vanilla; it is made from a mix of water-based vanilla bean extract and vanillin (C8H8O3) in a candy-sweet solution of corn syrup and alcohol. The mix of fake and real gives it an exaggerated hyper-real quality, like the flavor equivalent of an HDR photo.