Heat the oven to 350 degrees. Grease 2 (9- by 5-inch) loaf pans and set aside.
2
Cream the butter and sugar in a large mixing bowl.
3
Beat the egg yolks then beat into the butter and sugar with the nutmeg, wine and rosewater. Stir in the flour.
4
Beat the egg whites until moderately stiff, 3 to 5 minutes, and fold into the mixture. Divide the batter between the loaf pans and smooth the tops.
5
Bake the loaves until light brown and a toothpick inserted in the middle comes out clean, 1 1/2 hours. Cool the loaves in the pan slightly, then turn out onto wire racks.