Easy Weeknight Tortellini Soup

olive oil

large yellow onion, chopped (about 2 cups)

large carrot, chopped (about 1 cup)

sprigs fresh rosemary

link spicy smoked andouille sausage, diced (.25 lb link)

garlic cloves, minced

bunch collard greens, washed, stems removed and leaves chopped

box beef broth

package spinach or cheese tortellini

parmigiano reggiano, for grating

salt and pepper