Tortellini in Parmesan Brodo

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1 pound Parmesan rinds

1 carrot, peeled and chopped 

1 celery stalk, chopped 

1 head garlic, halved across the equator 

1 onion, halved 

4 sprigs fresh oregano 

2 sprigs fresh thyme 

1 bay leaf 

1 teaspoon salt, plus for pasta water 

1 pound spinach pasta tortellini (spinach pasta filled with cheese) 

2 tablespoons chopped fresh flat-leaf parsley