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Pesto Pasta (Pasta al Pesto)

Name: Pesto Pasta (Pasta al Pesto)
Prep time: 15 min
Cook time: 12 min
Total time: 27 min
Yield: 2 servings
Cuisine: Italian
Ingredients: 200 g Pasta; 1 tbsp Salt; 50 g Fresh basil leaves; 3 tbsp Pine nuts; 1 clove Garlic; 40 g Parmigiano cheese; 0.5 cup Olive oil; 0.5 tsp Salt; Black pepper

Fresh basil blended with pine nuts, garlic, Parmigiano, and olive oil, tossed through hot pasta — the Genoese classic. It is never cooked, only warmed by the pasta, so the green color and aroma stay vivid in this fast one-plate dish.

Ingredients

2servings

Pasta · trofie, linguine, or spaghetti200 g
Salt · for the pasta water1 tbsp
Basil pesto
Fresh basil leaves · about 2-3 cups50 g
Pine nuts · or walnuts3 tbsp
Garlic1 clove
Parmigiano cheese · finely grated40 g
Olive oil · extra virgin0.5 cup
Salt0.5 tsp
Black pepper · a pinch

Steps

Wash the basil and dry it completely. Lightly toast the pine nuts in a dry pan to bring out their aroma.
⏲ 2 min
In a blender (or mortar), combine the basil, pine nuts, garlic, cheese, and salt, drizzling in the olive oil until smooth. Blend in short bursts so the heat does not dull the color.
⏲ 1 min 30 sec
Boil the pasta in well-salted water for 1 minute less than the package time. Reserve half a cup of pasta water.
⏲ 9 min
Off the heat, toss the drained pasta with the pesto in a pan or large bowl, loosening with pasta water. Never cook the pesto.
⏲ 1 min
When the sauce coats the pasta creamily, plate it and finish with extra cheese and pepper.

Variations

Classic Genovese: Boil sliced potato and green beans with the pasta and serve together.
Nut swaps: No pine nuts? Walnuts or cashews work just as well.
Basil + spinach: Mellow the basil by blending in some spinach.
Add protein: Top with grilled chicken or shrimp for a full meal.

Tips

Never heat the pesto — warm it only with the residual heat to keep the green color and aroma.
Dry the basil thoroughly; wet basil makes a watery pesto.
A ladle of pasta water emulsifies the sauce so it clings silkily to the pasta.
Store leftover pesto with a thin film of olive oil on top to slow browning.

More detail and the reasons why (4)

This is the pasta whose emulsion was finished before the pan existed. Fettuccine Alfredo ranks its neighbours by what holds the sauce — "cacio e pepe uses starch alone, carbonara adds egg yolk, aglio e olio works with oil" — and all of those are built in a hot pan at the last moment, which is why they can break there. Pesto arrives already made, and the pan's only job is not to undo it. "Never heat the pesto" is that fact written as an instruction.
Which changes what the ladle of pasta water is for. In those four the starch is the emulsifier, so the water is structural (why sauces split keeps it for restoring a phase that boiled away). Here the emulsion is intact and the water is only loosening it to coating consistency — which is why it goes in off the heat, and why plain water would do the same job badly rather than differently.
The mortar is a flavour decision before it is a texture one. Fresh herbs names this dish and caprese as where the difference shows: finely chopped basil "oxidises where the blade cut it — it turns black and leaves its aroma on the board". Crushing ruptures cells without shearing them across, so the aroma goes into the oil instead of onto the board.
And drying the basil is the same argument from the other side. Water clinging to the leaves is water the oil has to carry, and an oil-in-water emulsion that was never beaten hard has no capacity for it — the sauce thins and separates in the bowl rather than in the pan.