Prepare vegetables: Peel the swede, carrots, and potatoes. Cut swede and potatoes into regular cubes, slice the carrots, but keep the different vegetables separated. Chop the onions finely.
Prepare meats: Chop the bacon into small pieces and cut the sausages into slices. Keep them separated.
Saute: Heat lard or oil in a large soup pot. Add bacon, onions, and carrots and saute them for about 5 minutes stirring occasionally.
Add swede and potato cubes, cook for about 2 minutes, stirring to coat them.
Cook: Add stock, marjoram, bay leaves, salt, and pepper. Cover, and bring to a boil. Simmer for about 30 minutes until the vegetables are almost done.
Add sausages and simmer for another 5 to 10 minutes until the vegetables are soft.
Adjust the taste with balsamic vinegar. Start with 1 tablespoon and add more to taste. Add salt as required and add a generous amount of freshly ground black pepper; the swede soup should taste somewhat peppery.