An emulsifier is an ingredient that is typically used to keep fat and water from separating in the product. When cooking at home, egg yolks are often used as an emulsifier. They also facilitate the moulding of chocolates into various shapes. PGPR is made from natural ingredients such as castor beans, soybean oil and sunflower oil. Another emulsifier used by Hershey is soy lecithin, which is commonly obtained from soybeans. It is not a substitute for the cocoa butter or fats used in chocolate.