Emerald dream, Pink stone, Watercolor Peony Round Cake Layers – Vanilla Butter recipe. 15cmx3cm / 6″x1.3″ by 6 layers August 5, 2019 / Save as PDF Quantity per student: 6 chilled and flat layers. Not allowed: Oil based cakes. Or sponge cakes. The cake used must be dense. Butter based like Pound Cake.