Bring a pot of salted water to a boil over high heat.
Throw in about a cup of small pasta and cook according to the package instructions.
Meanwhile, use a microplane to grate about 1½ cups of Parmesan and/or Pecorino cheese.
Cook the pasta all the way, then add about a cup of frozen peas directly to the water with the pasta and let it come back to a boil.
Scoop out and reserve about a cup of the pasta cooking water, drain your pasta and peas into a colander.
Return them to the still-hot pot along with the grated cheese, a splash of pasta water, and several cracks of black pepper.
Stir until the cheese is melted and coats the noodles, adding more cheese if needed and a bit more pasta water if things look too tight.
Taste and add more cheese and pepper to your preference, and eat immediately.
