Last weekend, I got the chance to dine at El Sacromonte, in Guadalajara and had a couple of dishes that incorporated Rose Petals.
First up were the Quesadillas with rose petals and strawberry aioli. They weren't really as good as they may sound. The rose petal was overpowered by the strawberries and the aioli didn't resemble anything but a jam or a coulis.
On the other hand. We did get the roast duck in rose petal sauce. Since it was such a huge dish, my wife and I shared. She got the leg and I got the breast. The sauce was really good, nicely sweet and it went really well with the duck. My only problem is that the duck was a tad dry. I believe my wife got the better end of this issue.