1. In a large pot of salted boiling water, cook spaghetti according to package directions, about 8 to 10 minutes.
2. Meanwhile, in a medium skillet add olive oil, onion, garlic, oregano, and salt. Warm over low heat. Remove from heat when oil begins to bubble and simmer, about 3 minutes.
3. In the bottom of a colander large enough to drain pasta, add the tomatoes and zucchini. Place colander in clean sink.
4. When pasta is cooked to your liking, pour it and the hot cooking water into colander over the veggies. Allow the water to drain over and past the veggies, and out of the colander, and then down the drain. The hot pasta will remain above the veggies. Let stand 1 minute.
5. Transfer pasta and vegetables to serving bowl or platter. Pour olive oil mixture over pasta, toss to coat. Serve warm.

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