Cool Minted Sweet Onion Soup

Prior to the arrival of tomatoes, bell peppers, and chillis from the New World, cold Spanish soups called gazpachos were not red. The recipe here is typical in its raw vegetables, olive oil, and bread thickening, but atypical in its major ingredients: sweet/mild onion and Iceberg lettuce, which provide both body and liquid. If you ask tasters to identify the ingredients, you may be as surprised by the answers as I was. The components blend so subtly that few will recognize what makes up the