1. Bring a pot of salted water to a boil. Meanwhile, cut off the core of the cabbage and remove any wilted leaves.
2. Cut the cabbage in half or quarters. Blanch it in the boiling water for 20 minutes.
3. In another pot, bring water to a boil and add the sausages. Boil them for 5 minutes (this will help them hold their shape during cooking).
4. Peel and chop an onion and a carrot into small pieces. In a large pot, heat olive oil and a little butter. Sauté the sausages, carrot, and onion. Remove the sausages and set them aside.
5. Off the heat, add flour to the pot and stir until it absorbs all the liquid. Stir until the mixture is smooth, then add white wine and water, salt and pepper, and a bouquet garni.
6. Add the cabbage and let it cook for 45 minutes with the lid on (the cabbage should be covered with liquid). Then uncover, add the sausages and peeled potatoes, and let it cook for another 45 minutes uncovered.