Raspberry Lemon Swirl Cupcakes

To make the buttercream, whisk all the ingredients together on high speed for several minutes until you have smooth, stiff peaks. Put half of the buttercream in a bowl. Tint the remaining buttercream with raspberry purée and a bit of food colouring - you will need to add more icing sugar to achieve stiff peaks as the purée will thin it out.

Fit a large piping bag with a large star tip. Lay the bag on it's side and carefully fill half the side of the bag with lemon buttercream. Flip over and fill the other side with raspberry buttercream. This will create the swirl effect. Pipe the buttercream on the cupcakes.