01 - In a medium saucepan, combine the rice, whole milk, heavy cream, lemon peel, cinnamon stick, and salt. Bring to a gentle simmer over medium heat, stirring occasionally to prevent sticking.
02 - Reduce heat to low and cook for 25–30 minutes, stirring often, until the rice is tender and the mixture has thickened considerably. Remove and discard the lemon peel and cinnamon stick.
03 - Stir in the sugar, butter, and vanilla extract. Continue cooking for 2–3 minutes, stirring constantly until the sugar has completely dissolved.
04 - In a separate mixing bowl, whisk the egg yolks until smooth. Gradually add a few spoonfuls of the hot rice mixture to the yolks, whisking continuously to temper the eggs and prevent curdling.
05 - Return the tempered yolks to the saucepan. Cook gently over low heat, stirring constantly for 2–3 minutes until the mixture thickens slightly. Do not allow the mixture to boil.
06 - Pour the custard into individual ramekins or a large serving dish, spreading evenly.
07 - Combine the 2 tablespoons granulated sugar with the ground cinnamon. Sprinkle evenly over the surface of the custard.
08 - Let the rice custard cool to room temperature. Serve warm or refrigerate and serve chilled.