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Brush or spray the tomatoes and onions with oil. Grill over Direct Medium heat until the tomato skins begin to blister and the onions are tender, 8 to 10 minutes, turning once or twice. Transfer the tomatoes to a bowl and when cool enough to handle, peel away the skins and discard [work over the bowl to reserve all of the juices]. Place a sieve over a large saucepan and gently squeeze the tomatoes over the sieve to catch the seeds. Discard the seeds. Roughly chop the tomatoes and onions and add them to the saucepan along with the tomato juice from the bowl, the chicken stock, garlic, and thyme. Bring the soup to a boil then reduce the