When it comes to parfaits, the secret to their success and appeal likes in the layering. After all, many of these snacks or desserts are more a matter of assembly than any real cooking, and this version is decidedly one of those, combining broken pieces of ladyfingers, plain yogurt (soy is called for, but feel free to use whichever variety you prefer), sliced fresh peaches, plum jam, and corn flakes as the crunchy topping.