Bring the meat stock to a boil and simmer the carrots, potatoes, leek and bacon for 15 minutes.
Heat the lard in a pan and sweat the onions in it.
Add the Brussels sprouts and onions to the stock, season with salt and pepper and simmer over a low heat for approx. 20 minutes. Add the sausages 10 minutes before the end of the cooking time and heat.