Drain sauerkraut and rinse.

Put sauerkraut in a pot and cover with water. Add salt and caraway seeds. Boil 5 minutes, then drain. Set aside.

In a fry pan, brown sliced onion and sugar in butter.

Add grated potato and just cover with water. Add 1 Tbsp vinegar and boil for 10 min. or until grated potato is tender.

Pour this over the sauerkraut and mix.