Heat an 8-quart saucepan over medium heat with olive oil. Add the onion and garlic, and sweat for 2 minutes. Add the peppers and saute for 10 minutes. Add the tomatoes and zucchini, and cook down for 10 more minutes. Add the vinegar and simmer for 2 more minutes. Check seasonings and remove from heat. Add the basil and serve.
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