Cook diced onions in olive oil.
Add peas, salt, and pepper.
Add hot water.
Blend most of the peas (leaving some unblended) and add them back to the pot along with the unblended peas.
Add dry pasta and cook it in the sauce, adding more water as needed.
Once the pasta is cooked, whisk an egg with both grated Parmesan and Pecorino cheese and stir it into the hot pasta until creamy.
