"If you've got the grill going already, this makes a great side that's easy enough to throw together...."
INGREDIENTS
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2 sweet onions, cut crosswise into 1-inch-thick slices
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2 tablespoons extra-virgin olive oil, plus more for brushing
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Salt
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2 large eggplants, cut into 1/2-inch-thick strips
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2 large zucchini, cut into 1/2-inch-thick strips
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2 ribs celery, finely chopped
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2 1/2 cup canned diced tomatoes with roasted garlic
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1/2 cup pitted black olives, preferably nicoise
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3 tablespoons balsamic vinegar
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1 tablespoon capers
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Pinch crushed red pepper (optional)
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1 bunch fresh basil, leaves thinly sliced and stems discarded
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1 baguette, halved lengthwise