In a pan with high sides or a small pot, over medium heat, add the olive oil.
Once olive oil is heated through, throw in the chopped onion. Cook it for a few minutes until it's golden and fragrant.
Throw in the peas and zucchini. Toss them in the olive oil and onion for just a few minutes. Season with salt and pepper.
Cover the zucchini and peas with warm water. You will not use the full 800mL of water at this point, use just enough to cover the vegetables. Keep the extra water on the side.
Cook the zucchini and peas for about 5 minutes.
Remove about 1 ¼ cups of the peas and zucchini into a measuring cup, and using an immersion blender, blend until a smooth, bright green purée forms.
Pour the purée back into the pan. Adjust for salt and pepper. Let everything come to a boil.
Once the mixture comes to a boil, throw in the pasta.
As the pasta cooks, it will start to dry out. When it dries out, add more water. Keep doing this until the pasta is done to your liking. And make sure to keep stirring, or else the pasta will stick to the bottom of the pan.
Plate, and top with stracciatella, fresh basil and lemon zest, if desired. Buon Appetito!