Stick blender method: Place all ingredients in a jug just wide enough to fit a stick blender. Blitz until combined and fairly smooth, but don't make it a green smoothie! Use for the grilled vegetable halloumi sandwich.

Food processor method: Place everything except the oils in a food processor. Blitz until the basil is quite finely chopped. With the motor running on low, pour the oils in a thin stream. 

Note: Store leftover pesto in an airtight container for 2 days in the fridge. The best way is to smooth the surface then cover with a thin layer of olive oil. The next best method is with cling film touching the surface. Alternatively, freeze in a ziplock bag, spread out in a thin layer so you can break off bits as you need it.