Boil your eggs for 10 minutes until hard-boiled and then allow to cool. Once cooled, crack the shell on a hard surface and add to a bowl with a couple of drops of the food colouring. Shake the bowl until the cracked egg shell is totally covered and then gently peel them to reveal a marble effect on the surface of the egg.

Cut the eggs in half and scoop out the yolk. Put the yolk in a bowl and mix in the mayo and pesto and mix well and then add the mixture back into the eggs.