Either pass the soup through a food mill or use an immersion blender to achieve the desired thickness. (thethreelittlepiglets.com)
Turn out onto a flour surface and roll until you achieve the desired thickness. (kneadtocook.com)
Manufacturers are also concerned with the texture of whey protein and, to achieve the desired thickness and mixability, an assortment of substances are used. (blog.nkdnutrition.com)