My mother and I used to love Black Forest torte, but over time, we noticed that more and more restaurants were serving the kind made with an "edible oil product" (think Cool Whip) instead of real whipped cream. So, we'd ask our server what their cakes were made with - was it real whipped cream? The answer was always an indignant "Of course!", but the actual cake invariably had Cool Whip. I don't know if the waitresses were fibbing or if they genuinely didn't know the difference. In any case, we never went back to those restaurants (topic!).