Pasta with Peas and Lemon

I started cooking this pasta dish because of my love of frozen peas and my equally strong hatred of creating unnecessary dishes. 4 main ingredients, 1 pot, and it's done in as long as it takes to cook the pasta.

Ingredients

 * For 2 or 3 people:
 * 1 lb short pasta, such as mezzi rigatoni, rotini or farfalle
 * 1 bag frozen baby peas
 * zest of 1 lemon
 * Juice of 1/2 lemon
 * parmesan or pecorino romano cheese (or any hard aged Italian cheese)
 * butter
 * olive oil
 * salt
 * pepper

To make this for 1, simply use 1/2 a box of pasta, 1/2 the bag of peas, omit the lemon juice (or add just a squirt) and go easy on everything else.

Directions

 * 1) Bring a large pot of water to a boil, and add a small handful of salt - it's very hard to over-salt pasta water.
 * 2) Meanwhile, roll the lemon between your hand and the counter to get the juice flowing, and zest it with a grater.
 * 3) Add the pasta to the boiling water.
 * 4) When it is about 6 minutes away from done, add the peas.
 * 5) When the pasta is done, drain it and the peas and return them to the pot.
 * 6) Add about 2 tablespoons of butter and a bit of olive oil, and the lemon zest.
 * 7) Stir vigorously to help the butter melt and coat the cheese.
 * 8) Add a good pinch of salt (you can add more to taste later) about 10 grinds of pepper, and grate in as much cheese as you like—at least a handful.
 * 9) Stir vigorously, so that the cheese distributes instead of clumping.
 * 10) Taste and adjust seasoning.
 * 11) Consume!

Variations
Try adding broccoli, pine nuts, or other flourishes for garnish and/or additional flavor.