Pear Maple Johnnycake

Name: Pear Maple Johnnycake
Ingredients: 1 stick unsalted butter; 2 tablespoons sugar; 4 firm-ripe Anjou pears, peeled, halved lengthwise, and cored; 1/2 teaspoon grated nutmeg, divided; 1 cup all-purpose flour; 3/4 cup stone-ground cornmeal (preferably white); 2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; 3/4 cup whole milk; 1/4 cup pure maple syrup (preferably dark amber or Grade B); 2 large eggs, lightly beaten; Accompaniments: pure maple syrup (for drizzling); sour cream