01 -
Warm the olive oil in a medium soup pot over medium heat. Add the onion, carrot, and celery with a pinch of salt, then cook for 5-6 minutes until softened but not browned.
02 -
Pour in the chicken broth and bring it to a simmer. Cook for 3 minutes so the vegetables become tender and the broth picks up their flavor.
03 -
Stir in the pastina and cook according to the package directions, usually 5-7 minutes, stirring often so the pasta does not stick to the bottom.
04 -
In a bowl, whisk the eggs with the Parmesan. Slowly whisk in 1 ladle of hot broth from the pot to warm the eggs without scrambling them.
05 -
Lower the heat to low. Slowly stream the egg mixture into the soup while stirring. Stir in the butter, parsley, and black pepper, then taste and add salt only if needed.
06 -
Ladle into bowls and top with more Parmesan and black pepper. Add a splash of hot broth if the soup thickens before serving.