"Serve this dish with toasted bread to soak up the juices. To debeard the mussels, grab the beard with a kitchen towel for a better grip...."
INGREDIENTS
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1 large shallot, finely chopped
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1/4 onion, finely chopped (about 1/3 cup)
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1/4 cup dry white wine
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3 1/2 tablespoons unsalted butter, cut into 1/2" cubes
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1 tablespoon white wine vinegar
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4 1/2 pounds mussels, scrubbed, debearded
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Freshly ground black pepper
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2 tablespoons chopped flat-leaf parsley
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Special equipment: Cheesecloth