INGREDIENTS
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1 large baguette (about 3/4 pound)
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1/2 stick unsalted butter, melted
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2 onions, chopped
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2 tablespoons olive oil
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1 pound cooked ham, cut into 1/2-inch cubes
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4 large eggs
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1 quart whole milk
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1 teaspoon salt
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1/4 teaspoon freshly grated nutmeg
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6 cups spinach leaves (about 1 bunch), coarsely chopped
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3/4 pound Fontina cheese, grated