My mom adapted this from several recipes she found, in an attempt to copy the arroz con leche that we had while I was studying in Merida, in Mexico's Yucatan Peninsula. The bakery sold it in little plastic cups, at room temperature. This isn't a true 'pudding' since it doesn't have any eggs--but it sure is good! I haven't actually made this myself yet--just enjoyed it at mom's house! Warming the milk before adding to the rice helps to avoid longer cooking times. Simply warm the milk in the microwave or in another pan shortly before adding it to the rice. This dish can easily be halved if you don't need such a large amount (or doubled if you need more). This is a nice recipe to pour into individual serving dishes (custard cups or ramekins work well) while still warm. Sprinkle with a little extra cinnamon to garnish, cool, and eat cold or at room temperature.