For the corn relish: Grill or roast the corn to char. Remove the corn from the cob. Dice the tomato extremely small, almost to a pulp. Dice the onion, jalapeno, and garlic. Add tomato, onion, and garlic, and jalapeno to the corn. Microwave the vinegar until hot and steaming. Pour vinegar over corn and mix well. Allow to sit at room temperature until it's time to serve.