Cod with Garlic, Mushrooms and Vermouth

In a heavy 12-inch skillet, melt 3 Tbs. of the butter over medium-high heat. Add the mushrooms and cook, stirring only occasionally, until well browned, 5 to 7 minutes. Add the garlic and cook, stirring, until golden and fragrant, about 45 seconds. Add the vermouth, 3 Tbs. of the parsley, the vinega