Step 1
Peel the shallots and cut them thinly. Brown them in a pan with 5 sage leaves, 1 clove of garlic and the butter; add the peeled and diced apple, cook over high heat, stirring, for 5 minutes. Remove the garlic and set the apples aside. In the same pan, still on high heat, brown the sausage cut into 2 cm pieces for 5-7 minutes. Chop 2 lemon peels, a sprig of parsley and very little rosemary. Add to the sausage, leave to flavor for 1 minute and turn off the heat. Add the apples to the sausage and keep warm.
Step 2
Bring 1.5 liters of water to the boil with 1 bay leaf and 1/2 cinnamon stick, add salt, pour in the foil flour and continue mixing with a whisk until it starts boiling again. Lower the heat and continue cooking for 50 minutes, stirring occasionally. Remove from the heat and add the cream, mixing with the whisk.
Step 3
Serve the polenta piping hot, accompanying it with the sausage and its sauce.