INGREDIENTS
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2 1/2 cups all-purpose or pastry flour, plus more if needed for rolling
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1 tablespoon chopped chives
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1 teaspoon salt
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2 sticks (1 cup) cold unsalted butter, cut into chunks
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2 leeks, tops and bottoms trimmed, cut in half lengthwise
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16 ounces white mushrooms, washed and sliced
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2 tablespoons unsalted butter
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1 cup heavy cream
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8 large eggs
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2 cups grated Swiss cheese
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Salt and freshly ground black pepper
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1 tablespoon pesto
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8 thin slices prosciutto (or any good ham), chopped