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.
02 - Reduce heat to low and cook 25-30 minutes, stirring frequently, until rice is tender and mixture thickens noticeably. Remove and discard lemon peel and cinnamon stick.
03 - Stir in 1 cup granulated sugar, butter, and vanilla extract. Continue cooking 2-3 minutes until sugar completely dissolves.
04 - Whisk egg yolks in separate bowl. Gradually add 2-3 spoonfuls of hot rice mixture to yolks while whisking continuously to temper eggs.
05 - Return tempered yolks to saucepan. Cook gently over low heat, stirring constantly, 2-3 minutes until mixture slightly thickens. Do not let mixture boil.
06 - Pour custard evenly into individual ramekins or large serving dish.
07 - Mix 2 tablespoons granulated sugar with ground cinnamon. Sprinkle evenly over surface of custard.
08 - Let custard cool to room temperature. Serve warm or refrigerate until chilled before serving.