A few grains of coarse sea salt Crush the garlic and salt in a mortar. Add the pre-washed and dried basil leaves little by little. The basil leaves are also crushed with careful, swirling movements. When the leaves release their fragrant oils, it’s time to add the pine nuts. Once the ingredients are well crushed in the mortar, add the grated Parmesan cheese and a thin stream of olive oil. Cooking is done at room temperature, and consumption is best done immediately to avoid oxidation and darkening of the sauce. If it accidentally remains or we make a larger dose, we can store it in a tightly closed jar in the refrigerator, but not more than 2 days.
The other option is freezing. The recipe is different in each family or restaurant, but it is these small differences that make the tasting of the sauce a real thrill. Tradition dictates that pesto be prepared in a marble mortar and without access to any metal tools. The ingredients are crushed in the mortar with a special boxwood hammer. From the word pestello (hammer), by the way, comes the name of the sauce.
Although there is no heat treatment in its preparation, the pesto requires a solid dose of patience. Especially in cases where the traditional way of cooking by hand is followed. Naturally, it was not lacking for the Italian hosts from the Liguria region, who, while waiting for their husbands to return after a long voyage, had enough time to indulge in labor-intensive culinary magic. A little out of tradition are all the other variations of the pesto. And they are really many: pesto of dried tomatoes, with different types of nuts, with capers and anchovies, with arugula.