Created by JostLori on November 24, 2013
Step 1: Preheat oven to 425 degrees. In a 9-by-13-inch baking dish, toss pears and onion with butter and vinegar. Season with salt and pepper.
Step 2: Arrange pears and onion in a single layer (they should fit snugly in dish) and top with rosemary.
Step 3: Cover dish tightly with foil and bake until pears begin to soften, 20 minutes. Uncover and bake until pears are golden brown on bottom and tender when pierced with a knife, 15 to 20 minutes more.
Step 4: Sprinkle with fresh rosemary leaves if desired and serve warm or at room temperature.