01 - Combine the rice, whole milk, heavy cream, lemon peel strips, cinnamon stick, and salt in a medium saucepan. Place over medium heat and bring to a gentle simmer, stirring occasionally to prevent sticking.
02 - Reduce heat to low and simmer for 25–30 minutes, stirring frequently, until the rice is tender and the mixture has thickened to a creamy consistency. Remove and discard the lemon peel and cinnamon stick.
03 - Stir in the granulated sugar, butter, and vanilla extract. Continue cooking for 2–3 minutes, stirring until the sugar has completely dissolved and the butter is incorporated.
04 - Whisk the egg yolks in a separate bowl. Gradually ladle small amounts of the hot rice mixture into the yolks, whisking continuously to warm them gently and prevent curdling.
05 - Return the tempered yolks to the saucepan. Cook over low heat, stirring constantly, for 2–3 minutes until the custard coats the back of a spoon. Do not allow the mixture to boil.
06 - Pour the custard evenly into individual ramekins or a single large serving dish.
07 - Mix the remaining 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 for a comforting dessert, or refrigerate and serve chilled for a refreshing treat.