In a saucepan combine sugar, cinnamon sticks, and milk. Bring to a boil over medium-low heat.
In a bowl, beat the egg white until foamy, add the egg yolks one by one, and pour the boiling milk over the beating eggs, stirring with a spatula. Add Pisco and vanilla.
Serve in two glass cups, sprinkle with ground cinnamon, and serve immediately.
Recipe by PERU DELIGHTS at https://perudelights.com/beat-the-winter-blues-with-a-caspiroleta/