Here is the perfect soup for a warm fall evening, after a day of apple picking or a visit to a country farmstand. You can garnish this silken soup with finely shredded smoked ham, if you like. With a vegetable or green salad and toasted walnut bread, you have an easy menu for a Sunday night supper that asks almost nothing of the cook at the last minute. There is a lot to be said for the simplicity of serving chilled soup.