German Potato Salad - cooking recipe

Ingredients

potatoes, boiled in their skins, cooled, peeled and sliced *
1/2 finely chopped onion
3 Tbsp. mayonnaise
3 Tbsp. salad oil
1 1/2 tsp. salt or to taste
1/8 tsp. pepper
6 Tbsp. salad or tarragon vinegar
1/2 to 1 c. boiling water (depending on consistency of potatoes)

Preparation

*Three-quart pot makes enough to take to a potluck dinner; recipe may be reduced for a family dinner.