Please note: To make the 6 layered cake you see pictured; you’ll need to double the cake recipe only. All other measurements are enough to fill, crumb coat and finish decorating the cake.
Preheat a fan-forced oven to 140°C (275°F) or a conventional oven to 160°C (320°F). Spray three 20 cm (8 inch) cake tins with oil spray and line the bottoms with baking paper. Set aside.
Add the flour, sugar, baking powder and salt to a large mixing bowl and mix with a hand mixer until well combined.
Next, add the softened butter and mix on low speed until the mixture reaches a crumbly, sand-like texture.
Add the eggs, milk, oil, Greek yoghurt, mermaid flavoring and vanilla, and mix on low speed until all the dry ingredients are incorporated. Scrape down the side of the bowl and mix for another 20 seconds.
Split the batter into three separate bowls. Color one teal using teal food gel, the second one blue, using blue food gel and leave the third plain.
Divide the different colored cake mixture between the three tins. I find that using an ice-cream scoop makes it easy to distribute the batter evenly, ensuring that all three cakes will bake at the same rate.
Bake for 50–60 minutes, or until a toothpick inserted in the middle of the cake comes out clean. If the toothpick is coated with wet batter, continue baking for 10 minutes at a time until fully baked.
Allow the cakes to cool to room temperature in the tins, then chill them in the fridge overnight. Chilling your cakes overnight makes them easier to trim and decorate, so I always bake my cakes the day before I decorate them.
To trim your chilled cakes, use a cake leveler or large serrated knife to carefully trim the crust off the top of each cake. Then trim each cake in half. You’ll end up with 6 layers.
To crumb coat your cake, add a dab of frosting onto a 10” cake board or flat serving plate. Use a small offset spatula to spread the frosting around before adding the first cake layer. Gently press down the center of the cake layer to make sure it’s stuck to the frosting underneath.
Add the teal, blue and white frosting to three separate piping bags and snip the end of the bag off. Pipe a ring of white frosting around the first layer of cake. Then pipe a ring of teal, a ring of white, then blue and repeat that until you’ve filled the layer. Use a small offset spatula to smoothen out the frosting before you add the next layer of cake. Repeat the same frosting technique with the remaining layers. Place in the fridge and chill for 2 hours.
We’re going to carve away some of the cake to make way for the jelly ocean. You want to use a large knife to cut a slope shape on one side of the cake. You can freeze the offcuts and use them for cake pops.
Add frosting around the sides, on the slope and top of the cake. Use the small spatula to smoothen out the top and sides of the cake, taking care to fill in any gaps in between each layer of cake.
Use a cake scraper (otherwise known as a bench scraper) to smoothen out the frosting on the sides and top. Get it as neat as you can. This should just be a neat, thin layer of frosting which is aimed at trapping any cake crumbs so that random bits of cake crumbs don’t show up on the final layer of frosting. Chill for 2 hours or overnight.
Add another layer of frosting on the cake, get it as smooth as you can and chill for another 2 hours.
Once the cake has chilled and set in the fridge, wrap the cake in acetate. Would recommend going around the cake twice to seal it up well and prevent leaking. Wrap it three times in plastic wrap as an extra bit of security against leaking.
Add the crumbled gelatin in the mold you’ve created starting with the dark jelly first. Let’s move on to the