You can replace the 1 1/4 cups of white whole wheat flour with an equal amount of all-purpose flour. If you do this, reduce the milk in the recipe to 3/4 cup plus 1 tablespoon. The cake can be prepared a day in advance; keep it tightly covered at room temperature and frost it just before serving. The frosting can also be made a day ahead and stored in an airtight container in the refrigerator. Allow it to come to room temperature for easier spreading. Leftovers should be stored in the refrigerator, tightly covered, for up to 3 days. You can remove the fruit and store the cake for up to 5 days in the refrigerator or freeze it for up to 3 months.