One-Pot Penne with Zucchini and Parmesan

Shred zucchini on the large holes of a box grater. (You should have about 4 cups.) Toss with 1/2 teaspoon salt in a colander set over a bowl. Let stand 10 minutes.

Meanwhile, cook pasta in a pot of generously salted boiling water until al dente. Drain pasta directly over zucchini in colander set in sink. Transfer both to pot; toss with olive oil, Parmesan, garlic, and red-pepper flakes. Season with coarse salt and freshly ground pepper. Serve, dressed with more oil and cheese.