Pesto sauce

There are two ways of doing pesto sauce (that'll eat with spaghetti).

Here is the first one.

The second one is my favorite : go to the nearest supermarket, buy a little box where it's written "pesto sauce" (an Italian brand - Barilla, Bertolli, Corleone, Matterazi, Ferrari, Vespa, Ramazzoti or whatever - is better).
Go back home, open the box : that's done!