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Wash and dry produce.
Drain corn, then pat dry with paper towels. Halve, peel, and dice onion into ½-inch pieces. Halve, core, and dice green pepper into ½-inch pieces. Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Dice tomato into ½-inch pieces. Roughly chop cilantro.