"This elegant tian, a French dish of layered vegetables, is delicious warm or at room temp...."
INGREDIENTS
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2 tablespoons butter
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2 medium-size sweet onions, chopped
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Vegetable cooking spray
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1 medium-size Yukon gold potato, sliced
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1 medium-size zucchini, sliced
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4 plum tomatoes, sliced
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1 1/2 teaspoons kosher salt
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3/4 teaspoon freshly ground black pepper
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2 tablespoons butter, melted
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1/3 cup freshly grated Parmesan cheese