Cacio e pepe

1. Cook the pasta in salted, boiling water in two separate pans until al dente. Drain, reserving 1½ cups cooking water.
2. Melt 4 T butter in a large pan, add the pepper and cook for 1 minute, swirling the pan.
3. Add half the cooking water to the pan and bring to a simmer. Add the pasta and remaining butter.
4. Add the cheese, chilli and parsley and toss the pasta using tongs until the cheese melts. Add more water if it seems a little dry.
5. Serve immediately with wilted baby spinach cooked in olive oil and a squeeze of lemon juice.
Cook's note: Cacio e pepe means cheese and pepper. Think of it as a faster, silkier mac ’n cheese.
Use a fine Microplane or thefiner side of a grater to grate the cheese so that it melts easier for a creamier sauce. When wilting spinach, use a wide pan so that the spinach has enough room to cook.