Cook pasta according to packet instructions. While the pasta is cooking, steam, boil or microwave broccoli until just cooked. Place frozen peas in microwave-safe dish, add a tablespoon of water and cook for 3-4 minutes. Drain the pasta and add the broccoli, tuna, peas, pesto and add salt and pepper to taste. Add the spinach and allow it to wilt from the heat.
Optional: top with grated cheddar cheese or parmesan.