I can't think of too many occasions when a creamy yet refreshing frosted version of a lemonade is a bad idea.  A couple months ago, a friend of mine was praising the creamy, lemon-y goodness that is the Chick-fil-A frosted lemonade, and imploring me to create a homemade version of it - a Frosted Whipped Lemonade Like Chick-fil-A but better...  Well, here we are in the midst of the hottest time of the year, and there is no time like a summer heatwave to whip up a frosty version of America's favorite summertime beverage.  It seems lots of other people think so too, or so I hear, as apparently the…