Unwrap the cotechino sausage and prick it several times with a fork to allow the fat to render during cooking.
Place the sausage in a large pot and cover with 2 liters of water. Simmer over low heat for 2 hours, or until the sausage is completely tender.
Meanwhile, prepare the lentils: rinse them under cold water, then soak them for 30 minutes.
In a large skillet, heat the olive oil. Add the finely chopped onion, celery, and carrot, and sauté until softened, about 5-6 minutes.
Add the soaked lentils to the skillet, and cover with enough water to submerge them. Season with salt, pepper, and rosemary. Simmer over low heat for 25-30 minutes, or until the lentils are tender.
Once the sausage is cooked, remove it from the water and let it rest for a few minutes. Then slice it into approximately 1 cm thick slices.
Serve the cotechino slices with the stewed lentils, while hot. Garnish with fresh rosemary.
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