Candied orange slices are an elegant garnish for this cake. You can buy them at specialty food stores, though they are also easy to make at home: Place 1 1/2 cups water and 1/2 cup sugar into 1-quart saucepan. Cook over medium heat until mixture comes to a boil and sugar is dissolved. Slice an orange into thin (about 1/8-inch) slices. Cook slices in sugar syrup, turning occasionally, 30 minutes or until liquid has reduced to thick syrup. Remove from syrup; place onto cooling rack. Cool completely. Store refrigerated.