In a small pot over medium heat, whisk together the ingredients for the leche poleada, with the exception of the rice flour.
Allow the mixture to warm through, then gradually add the rice flour while whisking vigorously to avoid any clumps. Continue whisking after all the rice flour has been added and until the mixture has thickened into a smooth custard (about 5 minutes). Once thickened, remove from the heat and set aside.
Heat the oil in a skillet over medium-low heat and fry the whole plantains for about 15-20 minutes or until completely cooked through, turning it as it cooks for even cooking. The plantain should be golden brown on all sides when finished.
Slice the plantain in half lengthwise and gently create a pocket inside using a fork or spoon. Remove the inner string inside the plantain as this can be a little tough to chew on.
Stuff each plantain with the leche poleada, then top with a sprinkle of ground cinnamon and 4–5 raisins per canoa.
Enjoy!