Sift together flour and baking powder. In a stand mixer, combine cubed butter, sugar, 2 g Prova Gourmet Madagascar Bourbon Pure Ground Vanilla Powder (50g), and salt. Incorporate eggs, then flour and cream. Lastly add clarified butter.
Mix until smooth and transfer to a piping bag.
Chocolate Cake
Sift together flour and baking powder. In a stand mixer, combine cubed butter, sugar, 16 g deZaan Holland Rich Terracotta 20/22% Dutched Cocoa Powder, and salt. Incorporate eggs, then flour and cream. Lastly add clarified butter.
Mix until smooth and transfer to a piping bag.
In a greased and floured 8″ x 4.5″ x 2.75″ cake tin, alternate piping layers of the vanilla cake batter and chocolate cake batter. Use the tip of a knife to swirl the batter to create the marbling effect.
Bake at 310°F for 50 minutes. Remove from oven and unmold quickly, then wrap in plastic wrap. Freeze the cake.
Milk Chocolate & Rum Coating
Melt the 331 g Guittard Organic 38% Milk Couverture Chocolate Wafers and 33 g Prova Gourmet Fusion Rum Flavored Cocoa Butter, then blend together with the grapeseed oil.
Dip the frozen marble cake into the coating chocolate and leave to stiffen before slicing.