Tortellini, Greens, and Bean Soup

Here's another soup I love from Soup Makes The Meal by Ken Haedrich.

2 TBS olive oil or unsalted butter
1 large chopped onion
1 rib celery, finely chopped
3 cloves minced garlic
salt to taste
6 cups stock
1 tsp dried basil
9 0z package fresh tortellini
2-3 C stemmed and chopped spinach (or Swiss chard--I use spinach)
Pepper to taste
1 can garbanzos, rinsed and drained
1 TBS tomato paste
Parmesan cheese for garnish

I know you know the steps.....
Heat the oil over mod low heat. Add onion, celery, and garlic. Salt light and sweat under tight lid for about 10 min.
Add stock and basil and bring to a boil. Add greens and tortellini. Return the soup to a boil. Boil for about a minute, and then lower the heat to mod low and simmer, partially covered about 5 minutes. Taste the broth, adding salt and pepper as needed.
Add the chickpeas and the tomato paste. Simmer another 5 minutes. Serve piping hot and pass the Parmesan at the table.