Horchata kotor

Bahan-bahan (6 porsi)

• 1 cup uncooked long-grain white rice
• 1/3 cup honey or real maple syrup
• 2 teaspoons vanilla extract
• 1 teaspoon ground nutmeg
• 1 1/2 teaspoons ground cinnamon (plus more for serving)
• 4 cups canned coconut milk (or whole milk)
• 1 cup cold coffee or espresso
• 2 -8 ounces dark rum or Kahlúa ((optional))
• cinnamon sugar, for rimming ((optional))