A nutritious and restorative Italian-homestyle soup with tender chunks of potato in a creamy egg broth with Parmesan cheese and kale. A hearty vegetarian soup that's ready in less than 30 minutes.
Heat the butter and oil in a heavy saucepan over medium heat. Add the potato and cook for 2 minutes. Stir in the onion and cook for a few more minutes.
Pour in the broth, lower the heat, cover the pan and cook until the potato is soft, about 12 minutes.
Put the eggs, cornstarch and cheese in a medium bowl and whisk together. Scoop out 1 cup of the hot broth from the saucepan and add to the bowl, whisking until smooth
Slowly add the egg mixture to the soup in the saucepan, whisking constantly. Turn the heat down to low and continue cooking until the soup thickens, 4-8 minutes.
Stir in the kale. Serve in bowls with additional cheese, if you like.
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Notes
The soup is best served warm, as soon as it's ready.
Don't worry if small curdles form - those are the "little rags" (stracciatelle in Italian)!
Leftovers can be stored in an airtight container in the refrigerator. Reheat gently over medium heat, without bringing the soup to a boil