INGREDIENTS
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1/2 cup (1 stick) unsalted butter, cut into large pieces
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1/2 teaspoon coarse salt
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1 cup water
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1 cup all-purpose flour
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4 large eggs
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1/2 teaspoon freshly ground pepper
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1/2 cup finely chopped or ground Black Forest ham (2 ounces)
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1 cup finely shredded Gruyere cheese, plus 36 cubes (1/2 inch) for centers (8 ounces total)