How to Make It
Place first 6 ingredients into slow cooker
Meanwhile, chop potatoes and kale, add to slow cooker
Add sausage to slow cooker
Cook on low 8-10 hours
Place ~1/2 cup broth in a bowl, whisk in sour cream, stir mixture into soup
Serve with crusty bread (and wine!)
Note - The hard cheese rind will give the soup (especially the potatoes) a lot of flavor without the stinginess of the cheese itself. If you can't find hard cheese rinds at the cheese counter, just garnish each serving with 1 tbsp. shredded Pecorino or Parmesan cheese.