Step 1

Cook pasta according to package directions until al dente, reserving 1 cup of the cooking water; drain pasta.

Step 2

Make the sauce in the same pot: add ricotta, parmesan, lemon zest and juice, salt and pepper to taste and stir well.

Step 3

Stir in 1/2 cup pasta water until smooth.

Step 4

Add pasta and stir vigorously until pasta is well coated. continue adding pasta water as needed, until smooth.

Step 5

Stir in the arugula and serve immediately topped with remaining sauce from pan, extra parmesan, red-pepper flakes, and torn basil.