INGREDIENTS
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1 small onion, sliced thin
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1/4 cup olive oil
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2 medium zucchini, halved lengthwise and cut crosswise into 1/4-inch-thick slices
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2 garlic cloves, minced
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6 plum tomatoes, peeled, seeded, and cut into 1/4-inch dice
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1 teaspoon fresh thyme leaves, chopped
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1/4 cup dry white wine
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1 loaf Italian or French bread about 3 1/2 inches in diameter, cut diagonally into 1/2-inch-thick slices (about 20)
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10 thin slices provolone cheese (about 1/4 pound), halved