Arroz Doce, or Portuguese rice pudding, is a creamy and comforting dessert that is enjoyed throughout Portugal. Using a food processor can help in the preparation of the rice pudding. Start by pulsing rice in the food processor until finely ground. In a pot, combine the ground rice, milk, sugar, lemon peel, and cinnamon stick. Cook the mixture over low heat, stirring constantly, until the rice is cooked and the pudding thickens. Remove the lemon peel and cinnamon stick. In a separate bowl, beat egg yolks and slowly add a ladle of the hot rice pudding, stirring continuously. Pour the egg mixture back into the pot and cook for a few more minutes. Serve the Arroz Doce warm or chilled, sprinkled with cinnamon. It's a comforting and nostalgic dessert that is perfect for any occasion.