INGREDIENTS
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3/4 lb mushrooms, finely chopped
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1/4 cup finely chopped shallot
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2 tablespoons unsalted butter
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1/2 teaspoon salt
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1/4 teaspoon black pepper
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2 tablespoons crème fraîche or sour cream
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1 tablespoon finely chopped fresh tarragon
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12 slices Black Forest or Virginia ham (without holes; 10 oz)
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12 large eggs
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Garnish: fresh tarragon leaves
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Accompaniment: buttered brioche or challah toast
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Special equipment: a muffin tin with 12 (1/2-cup) muffin cups