Zuppa di salsiccia

This is such a lovely and simple soup. I have a note on this at the bottom, but it bears mentioning several times because it really makes a difference - save your Parmesan rinds and add to the soup while it simmers. It's delicious! I called this soup simply Italian Sausage, Chard and Cannellini Bean Soup, but Ben felt that it didn't have enough mystique. So I called it Zuppa di salsiccia, which Google Translate says means Sausage Soup.

1 or 2 Tbsps olive oil or bacon fat
1 lb spicy Italian sausage
1 onion, chopped
2 cloves garlic, minced
6 to 8 cups chicken stock
OPTIONAL: Parmesan cheese rind
1 tsp dried basil
1 tsp ground fennel
2 cans Cannellini beans, drained OR 8oz dry beans
Tender leafy greens such as Swiss chard or Turnip greens or young nettle tops, 5 to 6 large leaves
Salt, to taste (if you follow the NOTE, consider adding less salt, since the Parmesan rind will add saltiness)
freshly grated Parmesan cheese

1. If using dry beans, soak them the night before.
2. Drizzle the oil in a soup pot and squeeze the sausage out of their casings into it, then turn on the heat. When the sausage meat starts to sizzle, add the onions and mix to break up the sausage, then let cook until onions are soft and the sausage begins to brown. You will notice a stage when a lot of liquid is liberated from the sausage and the onion - the browning begins once this excess water is cooked off. (If you want to reduce the fat, you put the cooked sausage and onion mix in a colander and rinse with hot water).
3. Scrape the browned sausage bits off the bottom of the pan as the mixture cooks. Add the garlic and sauté 1 minute more. 
4. Deglaze the pan by adding the chicken stock, making sure to scrape off as much of the sausage that may still be sticking to the bottom of the pot. If using, add the cheese rind. Increase the temperature to bring to a boil.
5. Meanwhile, add the beans, the fennel seeds and the basil. If using dry beans, cook the soup for one hour or until the beans are tender.
6. Wash the chard, and cut out the stems. Slice the stems very fine, and add them to the soup. Once it starts to boil, reduce the temperature and let it simmer for about a half hour.
7. While the soup simmers, lay out the chard leaves on top of each other, fold lengthwise once or twice, and cut into thin ribbons, about ¼" wide.
8. When the soup has simmered at least 30 minutes, add the chard ribbons and simmer for another 10 minutes more, or until the chard is softened and the flavours have come out. Serve the soup hot, with freshly grated Parmesan cheese - the cheese adds to the flavour of the soup (see NOTE).

NOTE: If you happen to have a Parmesan rind in the fridge, add it to the soup when you first start simmering for added flavour.