To make the pesto, put all ingredients into a blender and blitz until you reach a rough texture. Taste and season if necessary with a little more salt or a squeeze of lemon.
Cook your pasta as per packet instructions and toss the pesto through - serve with some roughly chopped walnuts over the top and a sprinkling of finely grated pecorino.
Alternatively, use the pesto as a great base for pizzas or even a dip with crudité as a healthy snack.