For the genoise, you'll need:
12 large eggs at room temperature
1 cup (130g) confectioner's sugar
1 tablespoon rose extract
1/4 cup water
3/4 cup all-purpose flour
1/3 cup cornstarch (35g)
6 1/2 tablespoons unsalted butter, melted
For the cream, you'll need:
1 cup dried rose petals
3/4 cup water
3 tablespoons sugar
3 large eggs
1/4 cup confectioner's sugar + 2 tablespoons cornstarch
1/4 cup Karo syrup
1 1/4 cups unsalted butter, at room temperature
For the genoise, you'll need:
12 large eggs at room temperature
1 cup (130g) confectioner's sugar
1 tablespoon rose extract
1/4 cup water
3/4 cup all-purpose flour
1/3 cup cornstarch (35g)
6 1/2 tablespoons unsalted butter, melted
For the cream, you'll need:
1 cup dried rose petals
3/4 cup water
3 tablespoons sugar
3 large eggs
1/4 cup confectioner's sugar + 2 tablespoons cornstarch
1/4 cup Karo syrup
1 1/4 cups unsalted butter, at room temperature
Preheat the oven to medium (180°C)
Grease a 18cm diameter cake pan
Prepare the genoise: in a large bowl, combine the eggs and confectioner's sugar over a bain-marie
Beat for 5 minutes or until the mixture is almost warm
Remove from heat
In an electric mixer, beat at high speed until the mixture is thick and fluffy, and the bowl has cooled slightly
Reduce speed, add rose extract and water, and mix slowly
Sift half of the flour with cornstarch over the dough and mix slowly
Repeat the process, adding butter and mixing vigorously
Pour the batter into a prepared cake pan and bake for 35 minutes or until golden brown or a toothpick comes out clean
Remove from oven and unmold immediately
Let cool, wrap, and store at room temperature
Prepare the cream: combine the rose petals and water in a saucepan
Let stand for 2 hours or overnight
Cover and bring to a boil
Reduce heat and simmer for 10-20 minutes or until the rose petals are soft
In an electric mixer, beat the eggs until fluffy
In a small saucepan, combine sugar and Karo syrup
Bring to a boil, stirring constantly, until caramelized
Let cool slightly, then pour slowly over the eggs, beating at medium speed until cooled
Add butter, 1 tablespoon at a time, and continue beating
Add rose petal cream and beat again. Reserve
Assembly: cut the cake in half horizontally with a serrated knife
Moisten the cake with remaining sugar syrup and fill with half of the rose petal cream
Top with the other half of the cake, then spread the remaining cream over it
Chill before serving.