01 - Cook pasta in a large pot of salted boiling water as per package directions. Reserve 1/2 cup of the cooking water, then drain the pasta and set aside.
02 - While pasta cooks, combine fresh basil leaves, pine nuts, garlic cloves, grated Parmesan cheese, extra virgin olive oil, salt, freshly ground black pepper, and lemon juice in a food processor. Blend until the mixture is smooth, pausing to scrape down the sides as necessary.
03 - Heat a splash of olive oil in a large skillet over medium heat. Sauté the diced zucchini for 2 to 3 minutes until it becomes just tender. Add the peas and baby spinach leaves, cooking for an additional 2 minutes until the spinach wilts and the peas turn bright green.
04 - Add the drained pasta and prepared pesto to the skillet containing the sautéed vegetables. Toss thoroughly to ensure all ingredients are well coated, adding the reserved pasta water as necessary to achieve a creamy consistency. Fold in the sliced scallions.
05 - Serve the pesto pasta immediately, garnishing each portion with extra grated Parmesan cheese, fresh basil leaves, and a sprinkle of lemon zest for added flavor.