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Preheat oven to 325 degrees.
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In a bowl, mix together the garlic, thyme, basil, oil and salt.
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Thinly slice the tomatoes.
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On a large baking sheet, lay out the tomatoes in a single layer and spread the marinade over the tomatoes.
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Put the baking sheet on the middle rack and bake for approximately 45-55 minutes. It depends on the size of the tomato. The tomatoes will start to look a little shriveled up.
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Turn the oven up to 400 F for about 20 minutes to slightly caramelize the tomatoes.
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Keep an eye on them so they don't burn, although a little brown is okay.
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Measure all ingredients and add to the bowl of a food processor or blender.
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Puree for about 1 - 2 minutes or until smooth.