Dice, wash and drain the potatoes and set aside. Slice the sausage and set aside. In a large pot, sauté the onions in lard or bacon fat, taking care not to burn them. Add paprika until onions are red (or to taste as it can be quite hot.) Add the potatoes and the sausage to the onions in the pot. Fill the pot with water so that it is just about at the top of the sausage and potatoes. Cover with a lid and bring to a boil; once boiling, reduce heat to a simmer. Leave the lid off while simmering until the potatoes are cooked and begin to fall apart. Fold in the sour cream.