Rachael's Tuscan Soup

Heat a large Dutch oven over medium-high heat with 2 tablespoons olive oil. Add sausage, brown and crumble, then remove to plate to drain. Add another tablespoon of olive oil to the pan, add the pancetta and render for 2-3 minutes. Add onion and garlic, season with salt, pepper, fennel seeds and sugar, reduce heat a bit and cook onions 5 minutes, stirring occasionally. Add stock, rind and potatoes, bring soup to boil and cover, then simmer 15-20 minutes until potatoes are tender. Uncover soup and wilt in kale, add half-and-half and turn off heat. Season with nutmeg to taste and adjust salt. Remove rind. Serve soup in shallow bowls with charred bread and pass cheese and chili flakes alongside.