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