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3 tablespoons vegetable oil
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1 small red bell pepper, chopped
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1/2 small eggplant, peeled and chopped, about 1 cup
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1 small zucchini, chopped
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One 10-ounce package frozen spinach, thawed, chopped, and drained
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1 pound halibut fillets or other firm-fleshed white fish
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