Melt the butter in a frying pan with a dash of olive oil. Bake the sausages on medium heat until nicely browned.
Deglaze with white wine and add the stock. Reduce until the sausages are cooked.
While the sausages are cooking, heat in a pan of olive oil and garlic. When the garlic starts to brown, add the cavolo nero. If necessary, a dash of chicken broth or water. Sauté for 4 minutes and season with salt and pepper.
Place the sautéed cavolo nero on a plate and place the sausages on it. Serve hot.