INGREDIENTS
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1 large egg
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1 cup mayonnaise
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1 teaspoon Dijon mustard
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1 1/2 teaspoons Worcestershire sauce
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Juice of 1/2 lemon
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1 teaspoon Old Bay seasoning (plus more for sprinkling)
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Kosher salt to taste
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1 pound jumbo lump crabmeat (preferably unpasteurized and steamed, rather than boiled), picked through to remove shells
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5 slices firm, white sandwich bread, crust removed and cut into 1/4-inch dice (place in freezer about 20 minutes for easier cutting)
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1 tablespoon finely chopped flat-leaf parsley
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2 tablespoons melted butter (plus more for greasing the pan)
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Mustard Beurre Blanc:
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1 1/2 cups dry white wine
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1/2 cup finely chopped onion
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1 cup butter, cut into small pieces
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1 tablespoon Dijon mustard
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Salt