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Bring a medium pot (use large pot for 4 servings) of salted water to a boil. Once boiling, add penne to pot. Cook, stirring occasionally, until al dente, 9-11 minutes. Reserve 1 cup pasta cooking water, then drain.
Meanwhile, wash and dry produce. Trim and halve zucchini lengthwise; thinly slice into half moons. Dice tomato.