01 - Combine the rice, whole milk, heavy cream, lemon peel strips, cinnamon stick, and salt in a medium saucepan. 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 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.
04 - Whisk the egg yolks in a separate bowl. Gradually ladle small amounts of the hot rice mixture into the yolks while whisking continuously to temper them and prevent curdling.
05 - Return the tempered yolks to the saucepan. Cook gently over low heat, stirring constantly, for 2-3 minutes until the custard thickens slightly. Do not allow the mixture to boil.
06 - Pour the finished custard into individual ramekins or a large serving dish, spreading evenly.
07 - Mix the 2 tablespoons of granulated sugar with the ground cinnamon. Sprinkle evenly over the surface of the custard.
08 - Allow the rice custard to cool completely to room temperature. Serve warm or chilled, according to preference.