Spring Green Pasta with Parsley Walnut Pesto

Name: Spring Green Pasta with Parsley Walnut Pesto
Ingredients: For the Parsley Walnut Pesto; 2 cups fresh parsley; ½ cup toasted walnuts; ½ cup grated parmesan or romano; 2 garlic cloves; zest of 1 lemon; juice of ½ lemon; pinch of salt and pepper; ½ to ¾ cup of olive oil; For the Pasta; ½ lb. spaghetti or linguine; 2 medium zucchini julienned; 1 yellow squash julienned; 1 lb. small asparagus cut on the diagonal; ½ cup of peas; a good handful of fresh baby spinach; reserved ½ cup of pasta water