This not-overly sweet chiffon cake filled with rose-scented whipped cream is inspired by the aromatics found in Persian, Turkish, and Indian confections. Cardamom seeds have more flavor than the ground powder and are like little explosions of spice in the cake. From Bon Appetit, June 2005. I would recommend baking it in one 8 x 3 inch cake pan (for approximately 40 minutes) and slicing into three layers. You can also use more filling between the layers (1 1/2 to 2 cups), otherwise there will be a lot leftover. Preparation time does not include candied rose petal drying.