In a 4-cup food processor, add spinach, arugula, basil, parsley, garlic, lemon juice, pumpkin seeds, cheese and salt and pulse just until all ingredients are finely chopped. Pour in olive oil and continue to mix, stopping intermittently to gently scrape down the sides with a spatula as needed. Taste and adjust with more salt, lemon or oil to your taste. Serve immediately or transfer to an air-tight container for dinners through the week.