Using a stick blender blend the basil leaves until fine add the lemon zest and juice, pine nuts and half the oil and blend some more and then add the rest of the oil and blend for a few seconds more.

The above can all be done with a mortar and pestle if you prefer.

Bring a pot of salty water to the boil and cook your chosen pasta for 1 minute less than the instructions say.

Drain and return to the same pot and on a medium heat add the pesto and mix and toss the pasta for around for 2 minutes, once the pesto has warmed through and the pasta has cooked serve.