01 - Combine rice, whole milk, heavy cream, lemon peel strips, cinnamon stick, and salt in medium saucepan. Bring to gentle simmer over medium heat, stirring occasionally to prevent sticking.
02 - Reduce heat to low and cook 25-30 minutes, stirring frequently until rice is tender and mixture has thickened to creamy consistency. Remove and discard lemon peel and cinnamon stick.
03 - Stir in granulated sugar, butter, and vanilla extract. Continue cooking 2-3 minutes, stirring until sugar completely dissolves and mixture is smooth.
04 - Whisk egg yolks in separate bowl. Gradually ladle 3-4 spoonfuls of hot rice mixture into yolks while whisking constantly to temper eggs and prevent curdling.
05 - Return tempered yolk mixture to saucepan. Cook over low heat, stirring constantly for 2-3 minutes until custard thickens slightly. Do not allow mixture to boil or eggs will scramble.
06 - Pour custard evenly into individual ramekins or large shallow serving dish. Smooth top with spatula for even topping distribution.
07 - Mix remaining 2 tablespoons sugar with ground cinnamon in small bowl. Sprinkle evenly over surface of custard.
08 - Let custard cool to room temperature, approximately 1 hour. Serve warm or refrigerate for 2-3 hours and serve chilled.