1. Place corn in 5-qt Dutch oven and cover with water. Bring water to boil, reduce heat, and simmer corn for 8 to 10 minutes, or until corn is done. Remove corn from water and plunge into cool water. When cool enough to handle, cut corn from the cob.
2. Combine corn, onion, zucchini, green onions, peppers, and parsley in large bowl. Set aside.
3. Whisk together garlic, salt, pepper, sugar, cumin, mustard, hot sauce, oil and vinegar. Pour over vegetable mixture and toss to coat.
4. Refrigerate 8 hours before serving.
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