Pesto wind. Pesto branches.
The ship out on the sea
and the horse on the mountain.

The Mediterranean is what it is because the olive tree grows there. As three parts of its small and sour fruit are oil it was only a matter of time before what happened eventually happened.

At the Genoa port town, the coast capital of Liguria, they thought of emulsifying basil leaves with olive oil, adding nuts, garlic and sometimes cheese. 

You need:

basil
olive oil
walnuts or pine nuts 
garlic
salt and pepper 

How is it done?

1. Four cups of basil leaves, one of olive oil, one of nuts, 4 garlic cloves, a little salt and pepper and a food processor, blender or mortar and pestle. 

2. It can be preserved in a jar with a permanent layer of olive oil on top or frozen,
for which you can use ice cube trays, thus having smaller portions at hand.