Rainbow Layer Cake

Unassuming and simple from the outside, but when it's cut into this Rainbow Layer Cake has the most amazing layers of colour. This cake really does have the wow factor!

📝 Ingredients

• 225 g margarine
• 225 g caster sugar
• 4 large eggs
• 2 tsp vanilla extract or vanilla bean paste
• 225 g self-raising flour
• 2 tsp baking powder
• 420 g unsalted butter
• 840 g icing sugar
• 4-6 tbsp milk

👨‍🍳 Instructions

1. 1Preheat the oven to 160°C (fan assisted, 180°C non fan). Line your 6″ cake pans
2. 2Add the butter and sugar to your bowl and cream until light and fluffy
3. 3Add the eggs one at a time starting on a low speed and increasing it after each egg has been added. Add the vanilla and mix again before finally adding the flour and baking powder
4. 4Split the cake mix equally into 5 different bowls. Add a different colour of gel food colouring to each bowl
5. 5Pour each bowl of coloured cake mix into your prepared tins and bake in the oven for 10-15 minutes. They’re done when a cocktail stick comes out clean
6. 6Allow the cakes to cool slightly in the pans before turning out onto a wire rack and let them cool completely
7. 7Once completely cooled, level the cakes if needed so that they stack more evenly. You’re looking to take the smallest amount of cake off to make the cake flat
8. 8Mix the butter and icing sugar together until pale and smooth. Add enough milk until it is a smooth spreadable consistency
9. 9Starting with the blue layer, place one layer onto your cake board and then add a generous layer of buttercream. Repeat with all 5 layers
10. 10Once all of the layers are stacked, it is time to apply the crumb coat. Do this by applying a thin layer of buttercream to cover the whole cake. At this stage it doesn’t have to look pretty. After you’ve applied your crumb coat, but in the fridge for at least 30 minutes for it to set slightly
11. 11Once the crumb coat has become firm to the touch, you can now apply the final layer of buttercream. Make sure you use quite a generous amount of buttercream and take your time!
12. 12You can decorate the cake however you would like. I chose to keep it completely plain on the outside and made some bunting to stick in the top