Oatmeal Florentines

Name: Oatmeal Florentines
Ingredients: 1 orange; 1 cup golden raisins; 2 sticks (1 cup) unsalted butter, at room temperature; 3/4 cup dark brown sugar; 1/2 cup granulated sugar; 2 large eggs; 1 1/2 cups unbleached all-purpose flour; 1/2 teaspoon baking powder; 1/4 teaspoon baking soda; 1/2 teaspoon table salt; 1/2 teaspoon cinnamon, preferably Saigon; 3 cups old-fashioned oatmeal (not quick-cooking or instant); 1 cup chopped semisweet chocolate or chocolate chips; 1/2 cup melted semisweet chocolate, slightly cooled