Assemble the cake by spreading a thin layer of buttercream on top of the first sponge. Then add a thick ring of buttercream around the edge and fill the centre with half the cooled butterscotch. Add the next sponge and repeat, then place the third sponge on top.
Cover the cake with a very thin layer of buttercream (crumb coat). You will cover the cake later with more buttercream so this layer doesn’t need to be neat.
Place the cake in the fridge for at least half an hour to chill.
Take approx. two thirds of the remaining buttercream and colour it green.
Cover the cake with the green buttercream and smooth the edges with an angled palette knife or straight edged cake scraper. Pop the cake back into the fridge for half an hour.
Colour two thirds of the remaining buttercream pink and colour the rest yellow.
Pipe your flower design onto the cake using a round piping tip (we used a Wilton 2A). For the petals, pipe 5 dots of pink buttercream in a circle and use a small palette knife to spread each dot of buttercream into the centre. Then pipe a yellow dot of buttercream in the middle of each flower.
With the left over buttercream, pipe a border around the bottom of the cake (we used a Wilton #21 tip).
Add sprinkles to add to the decoration (optional).