Swedish Princess Cake (Prinsesstårta)

Name: Swedish Princess Cake (Prinsesstårta)
Prep time: 1 h
Cook time: 40 min
Total time: 1 h 40 min
Cuisine: European
Ingredients: 4 eggs; 1 cup 200g sugar; 1/2 cup 70g flour; 1/2 cup 80g potato flour or (70g) cornstarch; 1 teaspoon baking powder; 1/8 teaspoon salt; 1 cup 240ml heavy cream; 4 egg yolks; 3 tablespoons corn starch; 1/4 cup 50g granulated sugar; 1 teaspoon vanilla extract; 1 envelope (.25 oz. powdered unflavored gelatin); 2 tablespoons cold water; 2 cups 480ml heavy cream, whipped; 1/4 cup powdered sugar; 1/3 cup vanilla American buttercream frosting (recipe here); 1/3 cup 96g raspberry jam; Powdered sugar for dusting; 1 lb. prepared marzipan; Leaf green food color; Ready made rose icing decorations (I used Wilton); Baker’s rose food color; Clear extract (any flavor)