Pesto Genovese
True pesto is made by friction, not by chopping. When you grind the basil leaves against the marble or wood, the essential oils release into the fat of the oil and cheese, creating a vibrant, uniform paste that coats pasta without separating.
Temperature control is your best friend.
Use cold ingredients and avoid overworking the basil. The heat generated by a food processor blade can turn the bright green leaves into a dull, bruised olive color.
- Mortar and pestle (preferred) or food processor
- Rubber spatula
- Small bowl
What goes in.
- 2 cupsfresh Genovese basil leaves, washed and dried
- 2 tbsppine nuts, lightly toasted
- 2 clovesgarlic, peeled and smashed
- 1/2 cupParmigiano-Reggiano, freshly grated
- 2 tbspPecorino Sardo, freshly grated
- 1/2 cupextra virgin olive oil, grassy and raw
- 1 pinchcoarse sea salt
Crush, don't cut
Using a mortar and pestle breaks the cell walls of the basil leaves, releasing chlorophyll and aromatics into the oil. If you use a food processor, pulse in short bursts—never hold the button down.
The method.
Make the base
Add the garlic and sea salt to the mortar. Grind until it forms a smooth, white cream. Add the pine nuts and continue grinding until they are crushed into a fine paste.
Add the basil
Add the basil leaves a handful at a time. Use a circular motion with the pestle to crush the leaves against the side of the mortar until you reach a consistent green paste.
Incorporate the cheese
Fold in the grated Parmigiano-Reggiano and Pecorino. Press the cheeses into the basil paste until fully absorbed.
Emulsify with oil
Drizzle the olive oil in a thin, steady stream while stirring slowly. The mixture should thicken and take on a glossy, uniform sheen.
Other turns to take.
Walnut Pesto
Replace pine nuts with lightly toasted walnuts for a deeper, more earth-forward flavor.
Dairy-Free
Omit the cheeses and add an extra tablespoon of pine nuts or a splash of pasta water to adjust the texture.
When it doesn't go to plan.
Pat the basil leaves completely dry after washing; any residual water will make the sauce watery and prone to separating.
If using a food processor, chill the bowl and blade in the freezer for 15 minutes before starting.
Add a tablespoon of warm pasta water to the pesto just before tossing it with noodles to help it coat every strand evenly.
The ones that keep coming up.
Can I store pesto for later?
Yes, but it oxidizes quickly. Keep it in a jar and cover the surface with a thin layer of olive oil to block out oxygen, then refrigerate for up to three days.
Why did my pesto turn brown?
The leaves were either heated by the blender blade or exposed to air for too long. If you aren't eating it immediately, keep the surface covered.
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