One-half cup of vinegar, Three-quarters cup of water, Three level tablespoons of cornstarch. Dissolve the starch in the water and add the vinegar and bring to a boil. Cook for three minutes and then remove, and add One egg, One teaspoon of salt, One teaspoon of paprika, Three-quarters teaspoon of mustard, One teaspoon of sugar. Beat to mix and then beat in one cup of sour cream. This dressing may be used on potatoes, chicken and celery salad and with cold meat or plain lettuce.