Peel and dice the onion and sweat in a saucepan until translucent. Deglaze with the vegetable stock. Add the diced potatoes with the chopped lovage and cook until cooked.
Cut the bacon into small cubes and fry them in a pan with a little oil. When the potatoes are done, add the bacon to the potatoes in the stock and puree everything. If you like, you can put some of the potato cubes and the bacon aside beforehand and then add it again as a filler.
Heat the sausages in the soup. Season to taste with salt, pepper and nutmeg. Sprinkle fresh herbs on the soup before serving.