This impressive rainbow ... This layer should be very thin, almost translucent in parts. Return the cake to the fridge for 10 minutes. Divide the remaining buttercream into 6 equal portions ...

Repeat this recipe using the remaining three food colour gels to achieve your six-layer rainbow cake. To make the icing, place the softened butter and vanilla extract into a large mixing bowl and ...

She described being asked for an 8-inch, 6-layer rainbow cake with vanilla buttercream and the words "Happy Birthday Trilby" on top, which Insider verified via the screenshots. She didn't name ...