Upside-Down Pear Gingerbread Cake

Name: Upside-Down Pear Gingerbread Cake
Prep time: 25 min
Cook time: 25 min
Total time: 50 min
Cuisine: European
Ingredients: 3 tablespoons butter; 1/3 cup packed dark brown sugar; 2 medium Bosc pears, peeled and thinly sliced; 1/2 cup 2% milk; 1 tablespoon cider vinegar; 1 large egg; 1/2 cup packed dark brown sugar; 1/3 cup molasses; 1/4 cup butter, melted; 1-1/4 cups all-purpose flour; 2 teaspoons ground cinnamon; 1 teaspoon baking soda; 1 teaspoon ground ginger; 1/4 teaspoon salt; 1/4 teaspoon ground cloves; Whipped cream, optional