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 to 30 minutes, stirring frequently, until the rice is tender and the mixture has thickened considerably. Remove and discard the lemon peel and cinnamon stick.
03 - Stir in the granulated sugar, butter, and vanilla extract. Continue cooking for 2 to 3 minutes, stirring until the sugar has completely dissolved and the mixture is smooth.
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 - Pour the tempered yolks back into the saucepan. Cook over low heat, stirring constantly, for 2 to 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 large serving dish. Smooth the top with a spoon for even topping distribution.
07 - Mix the remaining 2 tablespoons granulated sugar with the ground cinnamon. Sprinkle evenly over the surface of the custard while still warm.
08 - Allow the rice custard to cool to room temperature before serving. Serve warm for a softer texture or chilled for a firmer, set consistency.