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 add 3–4 spoonfuls of hot rice mixture to yolks while whisking constantly to prevent curdling.
05 - Return tempered yolks to saucepan. Cook over low heat, stirring continuously, 2–3 minutes until mixture slightly thickens. Do not allow to boil.
06 - Pour custard into individual ramekins or large shallow serving dish, spreading surface evenly.
07 - Mix remaining 2 tablespoons sugar with ground cinnamon. Sprinkle evenly over surface of custard.
08 - Let cool to room temperature, then refrigerate if serving chilled. Serve warm or cold as desired.