Peel the potatoes and carrots and cut them into small cubes. Peel the onions and cut them into strips.
Heat the butter in a saucepan and sauté the onions in it. Add the potatoes and carrots and sauté briefly. Pour in the vegetable stock. Simmer over a mild heat until the vegetables are soft. Remove from heat, let cool down a bit and puree. Season to taste with salt, pepper and maggi or lovage.
Reheat. Cut the soy sausages into slices and add to the soup. Let sit for a few minutes. Then serve hot.
Tip: Meat eaters best use around 200 g cocktail sausages.