"In this recipe, we poach the cod right on top of the asparagus. The result is perfectly cooked cod and tender-crisp asparagus. The sauce is our take on beurre blanc—a traditional French sauce made with wine and lots of butter. Ours uses a little cornstarch for thickening and a judicious amount of butter for flavor...."
INGREDIENTS
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1 lemon, divided
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1 cup dry white wine
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2 teaspoons cornstarch
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1 tablespoon thinly sliced shallot
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1 bay leaf
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5 whole black peppercorns
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1 1/4 pounds cod, cut into 4 equal portions
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1/2 teaspoon salt, divided
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1/4 teaspoon ground white or black pepper
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4 sprigs fresh tarragon
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1 1/2 bunches asparagus (about 1 1/2 pounds), trimmed
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1/2 cup water
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2 tablespoons butter