I have been watching food shows and I cannot understand why they mix dairy products. For example:
For a cole Slaw dressing: mixture of sour cream, butter milk and mayo...why not just use only mayo or only sour cream?(another food show)
For whipped topping: whipped heavy cream mixed with marscapone...why not just use the whipped cream(Giada)
A dessert component of a wolfgang puck recipe: mixes ricotta and creme fraiche...why not just use ricotta or creme fraiche?
A dip type thingy by the Barefoot Contessa" mixes yougurt and sour cream...why not just use one or the other?
Am I missing something here? If there is an article or other source that explains the rationale behind these combos, please direct me to it. I would love to learn more and why?