How to Make Real Basil Pesto: 8-Step Italian Recipe

Lay out everything before you start pounding. You need fresh basil (flowering bunches if you can find them), peeled garlic cloves, raw pine nuts, a wedge of real Parmigiano-Reggiano, a bottle of mild extra-virgin olive oil, and a small dish of coarse kosher salt. Pick the basil leaves off the stems while your mortar is empty. Don't worry about the occasional bit of flower or tiny stem piece - those add flavor.

Weight matters with grated cheese, not volume. Two ounces of Parmigiano grated on a microplane is roughly a cup and a half, not the half cup you'll see on most conversion charts. Set a small bowl on your kitchen scale, zero it out, and grate cheese into it until you hit two ounces. The fluffy microplane texture is what lets the cheese melt into the basil paste later.

Drop four to six peeled garlic cloves into the marble mortar with a large pinch of coarse kosher salt. The coarse salt isn't for seasoning here - it's an abrasive that helps the pestle grind the garlic into a smooth paste. Crush in a circular pressing motion, not a pounding one, and keep going until you have a yellow-green paste with no visible chunks. Garlic crushed this way tastes nothing like chopped garlic. It's sharper, more peppery, and more intense, which is exactly what raw pesto needs.

Ignore the recipes that tell you to add basil a few leaves at a time. Pack a large handful into the mortar with the garlic paste and start pounding. As the leaves break down and the volume drops, add another large handful, and then a third. A full mortar is easier to crush than a sparse one because the leaves crush each other against the walls. Some leaves will try to escape. Push them back in. Work until the basil is a fine green paste with no visible whole leaves.

Pour the raw pine nuts on top of the basil paste and pound them in. Don't toast them first - that's a different kind of pesto. Raw pine nuts give you the soft, slightly sweet, slightly resinous flavor that defines a real Ligurian pesto. Work the pestle in slow circles until the nuts break down and disappear into the green paste. There shouldn't be any whole nuts left, but a slight grainy texture from the nut oil is fine.

Add the grated Parmigiano in three batches, working each one in fully before the next. This is where the sauce stops looking like a green paste and starts looking like pesto. The cheese soaks up the basil oils and binds everything together. Press and stir with the pestle rather than pounding - you've already broken everything down, so this is more of a mixing motion.

Drizzle in the olive oil about a tablespoon at a time, stirring with the pestle between additions. The goal is an emulsion - oil and basil paste blended into a glossy unified sauce, not separated layers. After about half a cup of oil you should have a thick, spoonable pesto that holds its shape when you drag the pestle through it. Taste it. If it needs salt, add another pinch and stir.

Transfer the pesto to a clean bowl and drizzle a little extra olive oil over the top to slow oxidation. Serve it raw on toasted sourdough or warm focaccia - that's how it's best. If you want pesto pasta, do not heat the pesto in a pan. Spoon a few tablespoons into a warm serving bowl with a splash of starchy pasta water, drop the hot drained pasta on top, and toss everything together off the heat. Cooking pesto kills the fresh basil flavor that you spent 15 minutes building.