Heat olive oil, sauté diced onion with salt until translucent. Add a splash of water.
Add green peas, season with salt and pepper, cook for 5 minutes.
Blend half the peas, set aside the other half.
Boil salted water, cook pasta until 3 minutes under package instructions.
Add pasta water to blended peas, blend until creamy.
Drain pasta, reserve cooking water. Mix pasta, pea puree, whole peas, Parmesan, and pasta water.
Simmer for 1-2 minutes, adjust with pasta water for creamy sauce. Serve and enjoy!