I was cleaning out the refrigerator as well as my pantry when I put together this refreshing summer soup. If you can't get organic or Greek yogurt, free of gums and stabilizers, use buttermilk.
This silky, salmon-colored purée from Cordoba, Spain, is thicker and creamier than gazpacho Andaluz, just a simple mixture of tomatoes, bread, garlic and olive oil. Its success depends entirely on the...