Fresh vichyssoise

Chicken stock(chicken, carrots, celery, onion, kosher salt (salt, yellow prussiate of soda), water, whole black pepper), potatoes, water, leeks, onion, sour cream (cultured cream, enzyme), plain yogurt (cultured grade a reduced fat milk, food starch. contains active yogurt cultures including l. acidophilus), unsalted butter (pasteurized cream, natural flavorings), kosher salt, chives, white pepper