This simple pasta dish is a satisfying supper.
In a large pot of boiling salted water, cook pasta until al dente according to package instructions.
Meanwhile, in a large skillet, heat 1 tablespoon oil over medium. Add onion and garlic; cook, stirring frequently until translucent, 3 to 5 minutes. Add zucchini and 1/2 cup water; season with salt and 1/2 teaspoon pepper. Cover, and cook, stirring occasionally until zucchini is tender, about 10 minutes.
Drain pasta, reserving 1 cup pasta water; return to pot. Add zucchini mixture, remaining tablespoon oil, tomatoes, 1/2 cup Parmesan, and reserved pasta water. Season with salt and pepper; toss to combine. Serve immediately, sprinkled with remaining Parmesan.
CUTTING TOMATOES Quarter each tomato lengthwise, then use a paring knife to take out the pulp and seeds. Cut lengthwise into 1/4-inch-wide strips.