Place a few spinach leaves, garlic, pine nuts or sesame seeds, basil and a little oil in blender or food processor container. Cover and puree until leaves begin to look crushed. Continue adding spinach leaves a few at a time with small amounts of oil to blender, using a rubber spatula to help to combine pureed mixture. Add Parmesan cheese and sea salt. Cover and process until spinach pesto mixture is smooth. Meanwhile, cook pasta according to package directions; drain in colander. Serve with the spinach pesto sauce. Serves 4.