Peel the potatoes and cut into slices. Peel onion and garlic clove and chop finely.
Heat fat, stir in onions and garlic until translucent, add potato slices. Season with marjoram, paprika powder, caraway seeds and salt, add water. Cook the goulash for 20 minutes with the lid on.
Mix in sour cream. Cut the sausage into cubes or slices and mix them into the goulash.
In the countryside, people also like to eat a piece of fried blood sausage (Blutwürste) with the potato goulash.