INGREDIENTS
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2 large onions (about 1 pound)
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1 garlic clove
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about 1/2 cup olive oil
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a 26- to 32-ounce container chopped tomatoes
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1 tablespoon finely chopped fresh sage leaves
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1 1/2 teaspoons finely chopped fresh thyme leaves
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2 large eggplants (about 2 1/2 pounds total)
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4 large zucchini (about 1 3/4 pounds total)
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4 large red bell peppers
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2 tablespoons unsalted butter
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3 tablespoons all-purpose flour
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1 cup milk
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1 cup heavy cream
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3 large eggs
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6 ounces freshly grated Parmigiano-Reggiano (about 2 cups)