Pasta al Pesto Genovese Tradizionale (Basil Pesto Pasta)
Why this recipe works
- Fast by design: The pesto is made while the spaghetti boils, keeping the whole dish ready in about 15 minutes.
- Balanced savoury flavour: Fresh basil brings brightness, pine nuts add gentle richness, and the two cheeses give saltiness and depth.
- Glossy coating: A little starchy pasta water loosens the thick pesto so it clings smoothly to the spaghetti.
- Classic texture: Using a mortar and pestle crushes the basil and nuts into a cohesive paste with a naturally rustic finish.
Get the most out of this recipe
Authenticity notes
- Mortar-crushed pesto: The traditional method crushes the basil, nuts and garlic rather than chopping them, giving the sauce its thick, aromatic texture.
- Pasta shapes: Spaghetti works well, though pesto Genovese is also commonly served with trofie or trenette.
Timing notes
- Work while the pasta cooks: Make the pesto as the spaghetti boils so both are ready to combine while the pasta is hot.
- Serve straight away: Pesto is at its best immediately after tossing, before the basil aroma fades and the sauce thickens.
Ingredient swaps
- Pine nut alternative: Walnuts can replace pine nuts for a deeper, slightly more bitter nuttiness.
- Milder cheese blend: Use extra Parmesan in place of pecorino Romano for a softer, less salty finish.
Common mistakes
- Do not cook the pesto: Avoid heating pesto directly in a pan; the warmth of the pasta is enough to bring the sauce together.
- Add pasta water gradually: Loosen the pesto with small splashes of pasta water until glossy, rather than thinning it too much at once.
Equipment you'll need
Ingredients
Instructions
- Bring a large pot of water to the boil and season it generously with the fine sea salt. Add the spaghetti and cook until al dente, stirring once or twice.
- While the pasta cooks, add the pine nuts and garlic to a mortar and crush to a coarse paste. Add the fresh basil a handful at a time with a pinch of salt, grinding until you have a thick, bright green paste.
- Grate the parmesan and pecorino Romano cheese, then work them into the basil paste. Slowly stir in the extra virgin olive oil until the pesto is creamy and cohesive, then season with the black pepper.
- Reserve about 150 ml of the pasta cooking water, then drain the spaghetti. Tip the hot pasta into a mixing bowl, add the pesto, and toss, loosening with a splash of the reserved water until glossy and well coated.
- Taste and adjust with a little more fine sea salt if needed. Serve straight away while the pesto stays fragrant and bright.
Recipe notes
Tips
- For the brightest flavour, keep the pesto at room temperature and avoid heating it directly; the hot pasta and a little cooking water are enough to bring it together.
- If your basil is very delicate, add a little of the olive oil early on to help it crush smoothly without bruising too much.
Substitutions
- Replace pine nuts with walnuts for a deeper, slightly more bitter nuttiness.
- Replace pecorino Romano cheese with more parmesan for a milder, less salty finish.
Storage
- Refrigerate up to 2 days
- Pesto pasta is best eaten immediately. If you have leftovers, cool quickly and refrigerate; reheat gently with a splash of water and a drizzle of extra virgin olive oil, or eat at room temperature.
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Recipe overview
- Servings: 4 servings
- Total time: 15min (15min active)
- Difficulty: Easy
- Cuisine: Italian
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Allergens:
Milk Tree nuts Wheat
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