Halve the tomatoes crosswise. Lay the tomatoes cut-side up on a baking sheet. Drizzle with oil and sprinkle with salt and pepper. Cut each thyme sprig in half crosswise and place half a sprig on each tomato. Roast until the tomatoes are tender and beginning to brown, about 20 minutes.
Transfer the tomatoes to a plate and season with additional salt and pepper and serve.
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