Now blend again. Then add the lemon juice, the pine nuts and the grated parmesan cheese. Season with a little pinch of pepper and salt.
Check the seasoning and add extra pepper, salt or lemon juice to taste if necessary. Put the freshly made arugula pesto in the fridge until needed later on. Fill a large and high pan with cold tap water and add a good dash of salt. Place the pan over high heat until boiling. Then add the pasta and cook it until tender.