Place potatoes, carrots, and leek in large pot. Cover with water until all veggies are covered. Add bouillon cubes and a tsp of salt. Cook until veggies are tender.

While veggies are cooking, fry bacon and onion together. Set aside, do not drain off fat.

When veggies are tender, mash in the pot. Add the caraway seeds and continue cooking until thickened. Add the bacon, onions and bacon fat into soup. Cook until flavors are blended. Salt & pepper to taste. You may want to put a few dashes of soy sauce (or the German equivalent, Maggi).

Add the ring bologna and continue cooking until heated through, 4-5 minutes.