Add first eleven ingredients to a slow-cooker, and carefully stir to combine. Cook on low heat for 6-8 hours, or until the vegetables are tender. Remove bay leaf, and carefully stir in the kale. Let the stew continue cooking for 10 minutes or so until the kale is wilted. Season with additional salt and pepper if need be.
Step 2
Serve immediately, with the option to garnish with fried sage leaves or Parmesan cheese.