Rainbow Cake

Make little balls of fondant for the 7 colour. Your red ball will be the biggest one because it goes on the outside of the rainbow and the purple ball will be the smallest because it goes on the inside of the rainbow.
Roll your balls to make little snakes and place then in the shape of a rainbow. Use water to stick each snake to the other. Make little snail shapes at the end.
Use the left over coloured fondant to make little hearts with a cookie cutter.
Used the white fondant to make clouds with a knife.
Use yellow fondant to make a little sun.
Let it dry up for a few days on parchment paper, turning them upside down every day.

Preheat your oven at 350F (180C).
In the bowl of a stand mixer, add one egg with 30g of sugar and mix in on high speed for a few minutes. Until it doubles in volume.
Add one colour, little by little, until you have the desired colour.
Pour in the flour and gently fold it in until incorporated.
Pour it in a silicone mold and bake it until the side are golden, about 10 minutes.
Repeat for all the rainbow colours.
Let your 7 sponge cakes cool down.

Whip 500g of cream and 100g of sugar in a stand mixer until firm and fluffy.
Lightly brush the purple sponge cake with simple vanilla sirup.
Add a layer of whipped cream.
Repeat with all the sponge cake.
Add a light layer of whipped cream all around the cake.
Refrigerate for a few hours or over night.
When your cake is cold, make the rest of the whipped cream.
Using gel food colouring, make 3 quarters of the cream blue.
Use the white whipped cream on the top and the first third of the cake and the blue at the bottom.
Make it flat with a spatula.
Add all your fondant decoration as you want.
And voila!