12 ounces fettuccine (3⁄4 box)
1 tablespoon olive oil
2 leeks (white and light green parts), cut into thin half-moons
4 cloves garlic, thinly sliced
kosher salt and black pepper
1 cup corn kernels (from 1 to 2 ears, or frozen)
1/2 cup dry white wine
3/4 cup heavy cream
2 cups baby arugula (1 1⁄2 ounces)
1/4 cup grated pecorino (1 ounce)