1 pound (3 medium) potatoes 6 slices bacon, diced 1 medium−size onion, diced 1/2 cup vinegar 1/2 cup stock or bouillon 1 tsp. salt 1/4 tsp. pepper 1 tsp. sugar 1 egg yolk, beaten|Scrub potatoes; rinse. Boil in jackets; let cool. Peel and cut in 1/4−inch slices. Cook bacon in hot pan until crisp. Add onion; stir and cook until transparent. Add vinegar, stock or bouillon, and seasonings. Stir; let come to a boil. Stir in egg; remove from heat and pour over potatoes. Serves 2−4.