Wash the basil and drain well. The leaves must be perfectly dry, with no trace of water.
In the bowl of a food processor, pour in half the olive oil, add the Parmesan, peeled garlic cloves and pine nuts.
Blend until smooth.
Then add the basil leaves, the juice of half a lemon and a drizzle of olive oil.
Mix again thoroughly.
Gradually blend in the remaining olive oil until you reach the desired texture. You can adjust the amount of oil according to whether you prefer a thicker or thinner pesto.
Your basil pesto is ready!