Heat a large pot over medium-high heat.
Add the olive oil and saute the minced carrot, celery, onion, parsnip, and garlic until soft.
Add the chicken broth and the parmesan cheese rind. Bring to a boil.
Add the tortellini. Cook for 5 to 8 minutes, stirring occasionally.
Reduce heat. Stir in the shredded spinach, dried sage, and lemon juice. Season with salt and pepper to taste.
Cook 2-3 minutes more, until the spinach is wilted and the tortellini are al dente.
Scoop out what remains of the Parmesan cheese rind and discard.
Ladle the soup into bowls and serve.