Chop the onion and sauté it in extra virgin olive oil. Add the diced guanciale (optional) and sauté until the fat renders translucent.
Add the peas, sauté them for a couple of minutes and cook them for about 10 minutes, adding a little water (or vegetable broth) if necessary.
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Remove half of the peas from the pan and place them in a food processor, add a little water (or vegetable stock) and blend everything together to obtain a pea cream.
Pour the pea cream into the pan with the peas and guanciale, add a cup of water (or vegetable broth), bring to a boil, season with salt and then pour in the mixed pasta.
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Cook the mixed pasta over medium heat, adding a little water (or vegetable broth) at a time.
Once the mixed pasta with pea cream is cooked, season with salt and black pepper to taste, remove from the heat, add 4 tablespoons of grated mature pecorino cheese, and stir everything together to coat the pasta.
Bring the creamy pasta and peas to the table and serve with a sprinkling of grated pecorino cheese, if desired.