4
While you wait for the water to boil, make the pesto. Place all the ingredients except for the oil in a blender. Pour in half the oil and start pulsing in short, regular intervals to break down the ingredients. Slowly pour in the rest of the oil and carry on blending until you have a smooth, creamy, slightly loose pesto. Transfer to a small bowl, add a little more oil to cover the surface and then wrap in cling film until ready to use