From James Reason Alive and Cooking. Information given on the products used - Pura Sour Cream is a rich cultured cream with a distinctive tart taste. It has 35% butterfat and also comes in a Light variety that is reduced in fat (18%) that can also be used in this recipes. Pura Thicken Cream is the perfect cream for whipping into soft, light peaks but is also suitable for using as a pouring cream or in cooking. Pura Thickened Cream has been thickened to improve its stability and has a butterfat content of 35%. It is sometimes known as pouring or single cream.