Horchata is a traditional agua fresca commonly served in Spain, Ecuador, El Salvador, Honduras and Mexico.  Depending on the region, it may be made with sesame seeds, rice, tigernuts, barley, cinnamon, vanilla and sugar..

1/2 cup aged basmati
1/2 cup raw almonds
1 1/2 inches Ceylon cinnamon
1 1/2 cups boiling water
1 cup fresh whole milk, more or less
non-refined sugar to taste

Pulverize dry rice in a blender or food processor and transfer to a glass bowl.  Add almonds and cinnamon then pour boiling water over the top.  Cover and allow to stand overnight.

Transfer soaked rice, almonds and cinnamon to a blender and blend for 3 minutes.  Strain mixture into a clean container, thin with milk and sweeten to taste.