Fry the bacon until crisp. Remove from pan, drain and crumble.
Add the flour and onion to the fat in the pan. Stir in the vinegar, water, sugar, salt and spices. COok until medium thick. Cool.
Peel and dice potatoes. Sprinkle parsley and crumbled bacon over potatoes. Pour cooled dressing over all and mix gently to avoid mashing the potatoes.