Make Toast pine nuts in a dry skillet or frying pan until fragrant and golden, about 3 to 4 minutes.Place pine nuts, garlic, parmesan cheese (if using), basil leaves, and lemon juice in a food processor. Pulse until all ingredients are well chopped. With food processor running, drizzle in olive oil until smooth. (Add some additional olive oil if needed to help everything blend.)Season to taste with some salt and pepper.