1 lb (½ kg) potatoes; peeled, boiled and cut into cubes
2 hard boiled eggs
¼ cup mayonnaise
¼ cup sour cream
1 tablespoon yellow mustard
¼ cup sugar*
1 teaspoon vinegar
salt and ground black pepper, to taste
Place potatoes and chopped hard boiled egg whites in a large bowl.
In a small bowl, combine mayonnaise, hard boiled eggs yolks, sour cream, mustard, sugar, vinegar, salt and pepper. Mix well. Pour over potatoes and and gently stir until thoroughly coated. Refrigerate until cooled, at least 30 minutes, before serving.