No, Margaret, sour cream and yopgurt neither taste the same nor feel the same on the tongue. The usual procedure for the tzadziki is to ladle the yogurt into a strainer lined with cheese cloth, and allow it to drain at room temp for an hour or more. The longer it drains, the stiffer it gets. Sometimes I have to add back a bit of the drip water to loosen it! The "sourness" of yogurt is not the same as the "sourness" of sour cream -- I could stand and eat a half pint of sour cream just plain, if I didn't know that it's fattening. I would have to force myself to stand and eat a half pint of plain yogurt -- altho many people enjoy it. I wonder what makes sour cream provoke an allergy? How about other dairy products? So then, I do add a few tablespoons of LIGHT sour cream to the yogurt, because the texture of the end product is more to my liking. Amusing story: the husband of the Greek cooking teacher who wrote out the recipe which is in the cookbook hates dill. Therefore, she did not include it in the recipe for the tzadziki, not even as an option ..... I suppose she does not cook with it at all. Another cook's secret: when I am making something with mayo, I will often slip in one spoonful of sour cream. And when I am making something with sour cream, I will often slip in one spoonful of mayo. I think this gives the dishes a bit of pizzazz..... Penny, NY ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj.