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1
Preheat the oven to 300F.
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2
In a large ovenproof saucepan or casserole, heat 2 tablespoons of the oil over medium heat until shimmering.
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3
Saute the garlic, onion, and red onion until the onions are transparent, about 3 minutes.
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4
Add the tomatoes, tomato paste, basil, thyme, and stock and bring to a simmer.
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5
Season with salt and pepper and continue simmering.
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6
Meanwhile, in a large skillet over high heat, heat 1 tablespoon oil and saute the carrots and bell pepper until just tender, 3 minutes.
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7
Season them with salt and pepper and add to the simmering tomato mixture.
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8
Add another 2 tablespoons of the oil, heat until smoking, and saute the eggplant until just tender, about 2 minutes.
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9
Season with salt and pepper and add to the simmering tomato mixture.
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10
In the same skillet you used for the eggplant, heat the remaining 2 tablespoons of oil over high heat until shimmering.
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11
Add the zucchini and yellow squash and saute until tender, about 2 minutes.
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12
Season with salt and pepper and add to the simmering tomato mixture.
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13
Add the olives and capers and mix well.
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14
Cover and bake 1 hour.
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15
Add the vinegar, taste, and season with salt and pepper, if necessary.