freshly grating block parmesan cheese gives a much richer flavor than pre-grated powdered versions.
Avoid using spinach stems as they can impart bitterness; stick to the leafy parts for a cleaner result.
Do not overcook the pasta in the sauce on high heat, as this dulls the vibrant green color and diminishes the pesto’s aroma—remove from heat or stir gently over low flame.
Extra lemon juice and olive oil added to the finished pesto can transform it into a delicious salad dressing.