I wouldn't have believed it! I was scared it would taste overwhelmingly like olive oil, but NO. Miraculously, it is a subtle undertaste, but way overwhelmed by the rich chocolatiness of this mousse. A fabulous way to avoid all that cottonseed oil at Passover and unhealthy margarine desserts year-round!!! ADDED April 2010: This is still an incredible family favourite, for Pesach and year-round. We even had it in a pie shell with whipped cream on top once. Also works okay to halve it if you don't need as much.