A beautifully surprising cake recipe from How To Cook That is gaining millions of views because of a secret that is only revealed when the cake is cut.
The video recipe shows how to make a lovely sponge containing a surprise rainbow heart in the middle.
It's shockingly simple - all you need to do is knock together some cake mix with food colouring, bake and cut it into hearts and stuff them into the centre of another cake.
Advertisement
![](https://img.huffingtonpost.com/asset/5d01df7e2500006813e16eea.jpeg?ops=scalefit_720_noupscale)
Cutting this surprising cake unveils the wonderous and seemingly impossible multi-coloured rainbow heart in the centre.
How amazingly easy is that? It's bound to make anyone smile when they get a piece.