INGREDIENTS
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8 tablespoons (1 stick) butter
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1 small yellow onion, chopped
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1 cup sliced mushrooms
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Salt and cracked black pepper
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2 tablespoons all-purpose flour, plus more for dusting
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1 1/2 cups milk
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1/4 cup clam juice
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1/4 cup medium-dry sherry
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1/2 pound crabmeat, well drained and picked clean of shells
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1 cup frozen peas
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2 sheets frozen puff pastry, thawed
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1 egg, beaten with 1 teaspoon water, to brush pastry