Boil rice milk and reduce the heat to low. Stir the milk occasionally. Simmer the milk for about 30 minutes until the milk is reduced by about 2/3 of its volume. Add banana pur?e and apple butter. Add brown rice syrup and cardamom. Cool and keep in a refrigerator. Serve chilled. Hints: Add dried fruits and 1/4 teaspoon pistachios or almonds or cashews for variety (optional).