Tomato paste made these tomatoes more savory, while white balsamic vinegar gave them a bright, slightly sour note. Medium plum tomatoes, roughly 4 ounces each, worked best. If your tomatoes are smaller, start checking them after three hours in the oven. Slow-roasted tomatoes are a powerful pantry staple; add them to soups, sauces, pasta, polenta, sandwiches and salads.
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