Preheat the oven to 300┬░F. Slice the tomatoes in half lengthwise and put them in a large bowl. Drizzle with a 4-count of oil. Toss in the garlic and thyme; season with salt and pepper. Toss the tomatoes to coat in the flavored oil. Arrange the tomatoes on a sheet pan in a single layer, cut side up. Pour the oil from the bowl over the tomatoes and roast for 3 hours to concentrate their flavor. They should be shrunken and dry to the touch.
Edited: October 14th, 2009