We paired these tomatoes with fresh mozzarella cheese for a delicious topping for pizza. They can also be served on their own or used instead of canned tomatoes in soups and pasta sauces.
Preheat oven to 275 degrees. Slice tomatoes in half lengthwise, and place cut side up in a single layer on a rimmed baking sheet. Sprinkle with sugar, and season with salt and pepper. Place a few thyme leaves on top of each half, and drizzle lightly with oil.
Roast until tomatoes have started to shrivel and caramelize, about 2 1/2 hours. Remove from oven; let cool until ready to use, up to 5 days.