Cut the onion into cubes and sauté in a large saucepan in a little hot oil until translucent. Peel the potatoes and carrots, cut them into pieces and add them to the pot. Add the peas and pour the broth over them. Simmer for about 30 minutes with the lid closed. When the vegetables are nice and soft, puree everything. Pour in the cream and add the sliced sausages. Let it steep again for 5 minutes. Then season the whole thing with salt and pepper. Finally, depending on your taste, add a dash of Maggi to taste and sprinkle with the chopped parsley.