1. Thaw corn and toss lightly with peppers and onions with olive oill and garlic , spread evenly on cookie sheet then roast in oven for approx 25 minutes on 350 degrees 2. Pull from oven and place in large mixing bowl let rest 30 minutes . 3. Add tomatoes, cilantro and black beans and set aside.. 4. In a medium bowl, mix remaining ingredients for dressing. mix well and pour over vegetable mixture. 5. Toss well and let refrigerate several hours or over night for best results.