Add the rice to a blender, cover and blend until it becomes powdery. Add to a large bowl, with raw cashews, cinnamon sticks, orange zest and star anise. Add warm water and let soak for at least 6 hours, or overnight, allowing the ingredients to soften and infuse.
Remove the cinnamon sticks and star anise, then transfer the rice mixture with the soaking liquid and 2 cups water to a high-speed blender. Blend on high until completely smooth and creamy.
Pour through a fine mesh strainer with 3 layers of cheesecloth or nut milk bag into a large pitcher, pressing or squeezing gently to extract every bit of liquid. Discard the solids.
Stir in remaining 2 cups water, 2/3 cup sugar, and vanilla extract. Taste and add more sugar or a splash more vanilla extract if desired. Refrigerate until cold, at least 2 hours.
Stir before serving (it naturally separates), then pour over ice and garnish with a sprinkle of cinnamon or a twist of orange zest.
Notes
Tips for Storing
Keep refrigerated in a sealed glass jar or pitcher for up to 4 days.
Shake or stir before serving since natural separation will occur.
Freeze in ice cube trays for adding to iced coffee or smoothies.
Avoid heating — this drink is best enjoyed chilled.
Label with the date so you always know when it was made.