Mushroom-Red Wine Sauce

Melt the butter in a large skillet or saucepan over medium-high heat. Add the mushroom slices and cook until they release their juices and soften, 5 to 7 minutes. Add the salt and pepper. Continue to cook until the juices evaporate. Add the wine and rosemary. Bring to a simmer. Cook for 3 minutes. Pour or spoon the sauce over cooked meat.