- 1 (1/3 pound) piece Parmigiano-Reggiano with (roughly 3- by 3-inch) rind
- 6 cups chicken stock
- 4 large garlic cloves, thinly sliced
- 4 sprigs fresh parsley, tied together
- 1 tablespoon extra-virgin olive oil
- 1 cup tortellini (24 to 36)
- 4 cups loosely packed baby spinach leaves (3 ounces), cut into 1/2-inch-wide strips
- Cut rind off cheese. Combine rind, stock, garlic, parsley, and oil in a 3-quart pot, then simmer gently, partially covered, 30 minutes. Discard parsley and rind and season broth with salt.
- Add tortellini and simmer, partially covered, until al dente, about 10 minutes. Add spinach and simmer, uncovered, 1 minute. Divide among 4 soup plates, then shave cheese over soup to taste.