Di Ɱ - Opera propria, CC BY-SA 3.0, Collegamento
Ingredients
- Basil leaves 25 gr.
- Extra virgin olive oil 50 ml.
- Parmesan cheese to be grated 35 gr.
- Pecorino to grate 15 gr.
- Pine nuts (Pinoli) 8 gr.
- Garlic ½ clove
- Coarse salt 1 pinch
Preparation
To prepare the Genoese pesto it is first necessary to specify that the basil leaves are not washed, but cleaned with a soft cloth; in addition you must make sure that it is Ligurian or Genovese basil, with narrow leaves (and not the thick-leaved southern one, which often has a mint flavor). Start preparing the pesto by placing the peeled garlic in the mortar along with some grain of coarse salt. Begin to pound and, when the garlic is reduced to cream, add the basil leaves together with a pinch of coarse salt, which will serve to better break the fibers and keep a nice bright green color.
Then crush the basil against the mortar walls by rotating the pestle from left to right and at the same time rotate the mortar in the opposite direction (from right to left), taking it for the "ears", or the 4 rounded protrusions that characterize the mortar itself . Continue like this until a bright green liquid comes out from the basil leaves; at this point add the pine nuts (9) and start pounding again to reduce to cream.
Add the cheeses a little at a time, stirring constantly, to make the sauce even more creamy, and lastly the extra virgin olive oil that will be poured in flush, always mixing with the pestle. Mix the ingredients well until a smooth sauce is obtained. Your authentic Genoese pesto is ready to be used!
Storage
Keep the freshly prepared pesto in the refrigerator, in an airtight container, for 2-3 days, taking care to cover the sauce with a layer of oil.
It is possible to freeze the pesto in small jars and then thaw it in the refrigerator or at room temperature.
Curiosity
To obtain an excellent Genoese pesto, the basil leaves must necessarily be dry, and must not be wrinkled in any way, since the rupture of the vesicles containing the essential oils placed on the upper part of the leaves, would cause oxidation of the color and the aromas, making the dark green pesto with a herbaceous aroma.
For the preparation of Genoese pesto, use sweet and ripe oil because the latter, in addition to acting as a solvent for the aromatic substances, ensures the perfect amalgam, enhancing the aroma of basil and attenuating the spicy garlic.
Advice
Like apples and aubergines, basil is also oxidized, alas. If you do not want to find in your hands a pesto that, although good, looks like squid ink, you have to use two measures: 1. work it at the speed of light (exposure to oxygen is one of the causes of oxidation); 2. avoid overheating (high temperatures are the other). And here we have to talk about the blender. If you do not even want to see the mortar and pestle, you can use the blender (if possible, with plastic blades, the metal makes the leaves bitter): you will get a creamy pesto, but still very good. To avoid overheating, you can blend at the lowest possible speed and in jerks, ie blend a few seconds, stop and start again. Another trick: leave the cup and the blades in the fridge an hour before use, the coldest of it :)