Place pork loin and olive oil in slow cooker. Mix all seasonings in a small bowl and sprinkle over pork loin. Top with sliced onions. Pour orange and lime juices over pork. Cook on low heat in slow cooker for 10 hours, turning meat every few hours. Remove pork. Allow to cool for 15 minutes and slice very thin.
Top Cuban Pork with our Pickled Cabbage and Cucumbers recipe.