4 lb. Red Bliss potatoes
1 1/2 c. mayonnaise
3 tbsp. vinegar
1 tbsp. sugar
1 medium onion
salt and pepper to taste

Boil potatoes in their jackets until done. Peel while still hot; let cool. Slice in thin round slices. Mix in mayonnaise, vinegar and sugar. Grate onion and add with salt and pepper. Mix again. Chill thoroughly for 3 hours.