For me there is nothing more refreshing on a hot day than a bowl of cold sour cherry soup. Sour cherries are revered in Hungary, where they are made into pies, strudels, tarts, and soups. Since sour cherries are in season right now, I picked up a quart last week at the farmers' market specifically to make this soup. Cold soups, mostly savory, are enjoyed throughout Europe in the summertime. Sour cherry soup is technically a sweet soup, but because of its tartness it works well as a first cour...
