Step 1: Make the Sponge Cake
Preheat your oven to 350°F (175°C). Grease three 8-inch round cake pans and line with parchment paper.
In a large bowl, beat the eggs and sugar together on high speed for about 5 minutes, until thick and pale.
Sift the flour, baking powder, and salt into the egg mixture. Gently fold in with a spatula.
Heat the milk and butter together until the butter melts. Stir in vanilla extract.
Gently fold the warm milk mixture into the batter until fully combined.
Divide the batter evenly between the three pans and bake for 12-15 minutes, or until a toothpick inserted in the center comes out clean.
Let the cakes cool completely before assembling.
Step 2: Prepare the Custard
In a saucepan, heat the milk over medium heat until warm but not boiling.
In a separate bowl, whisk the sugar, egg yolks, and cornstarch until smooth.
Slowly pour the warm milk into the egg mixture, whisking constantly.
Return the mixture to the saucepan and cook over low heat, whisking until thickened.
Remove from heat, stir in vanilla extract and butter, and let cool completely.
Step 3: Whip the Cream
In a large bowl, beat the heavy cream, powdered sugar, and vanilla extract until stiff peaks form.
Step 4: Assemble the Cake
Place one sponge cake layer on a serving plate. Spread a thin layer of raspberry jam over the top.
Add half of the custard filling, then place the second sponge cake layer on top.
Spread the remaining custard on the second layer, followed by a thick dome of whipped cream.
Place the final sponge cake layer on top and gently press to secure.
Cover the entire cake with the remaining whipped cream, shaping it into a dome.
Step 5: Cover with Marzipan
Lightly dust your surface with cornstarch and roll out the green marzipan into a 14-inch circle.
Carefully lift the marzipan and drape it over the cake, smoothing it down the sides. Trim any excess.
Dust with powdered sugar and place a pink marzipan rose on top.
Step 6: Serve & Enjoy!
Refrigerate for at least 1 hour before slicing.
Serve chilled and enjoy this classic Swedish delicacy!