2 tablespoons butter 1/2 onion, thinly sliced crosswise (into half-moon shapes) 8 ounces sliced mushrooms 1/2 teaspoon or so crushed garlic (2 small cloves or 1 large) 1/2 teaspoon salt 1/4 teaspoon pepper 2 teaspoons Worcestershire sauce (white or traditional) Heat butter in a medium, heavy-bottomed saucepan over medium-high heat. Add onions and cook for…