"I have experimented with many ingredient amounts for pesto, I have finely found the one that has a perfect balance of flavor --- this will keep covered in the refrigerator for up to 5 days, if you are storing it in the refrigerator I suggest to place a 1/2-inch layer of oil on top of the pesto and cover with a lid or you may freeze --- the success of this recipe will depend on the quality of Parmesan cheese that you use, if possible try to use a good quality freshly grated cheese it really will make a difference with the taste of the pesto, and please use only kosher salt --- FOR RED PESTO; reduce the basil to 3 cups, and add 1/2 cup chopped oil-packed sun-dried tomatoes to the blender along with other ingredients...."