Step 1: Gather and prepare your ingredients. Wash the fresh basil leaves thoroughly and dry them completely. This is crucial! Any water left on the leaves can make your pesto watery and less flavorful. A salad spinner is excellent for this, or gently pat them dry with paper towels. Peel the garlic cloves.
Step 2: (Optional, but recommended) Lightly toast the pine nuts. In a dry skillet over medium-low heat, add the pine nuts. Toast for 2-4 minutes, stirring frequently, until they are fragrant and lightly golden. Be vigilant, as they can burn quickly. Remove from heat and let cool slightly.
Step 3: In the bowl of a food processor, combine the dried basil leaves, toasted pine nuts, peeled garlic cloves, and a pinch of salt.
Step 4: Pulse the ingredients a few times until they are coarsely chopped. Scrape down the sides of the bowl as needed to ensure everything is evenly processed.
Step 5: With the food processor running on low speed, slowly drizzle in the extra virgin olive oil in a steady stream. Continue processing until the mixture is smooth and creamy, but still retains a slight texture. Avoid over-processing, which can warm the oil and turn the pesto bitter.
Step 6: Add the freshly grated Parmigiano-Reggiano cheese to the food processor. Pulse a few more times until the cheese is just incorporated into the pesto. You don't want to overmix at this stage; a few quick pulses are enough.
Step 7: Taste your homemade basil pesto and adjust seasoning as needed. You might want to add a bit more salt, or even a squeeze of fresh lemon juice for brightness, although traditionally it's not included. Serve immediately or store for later.