This is the universally well-known and original pesto that hails from Genoa in the Ligurian region of northern Italy. It keeps well for a month, refrigerated.
In a food processor, blend the basil leaves with the salt and 50ml of the olive oil until a paste has formed. Add the pine nuts, garlic and pepper and pulse to a paste.
Drizzle in the remaining olive oil with the motor running and process until smooth. Remove the pas