Apple and Olive Oil Cake with Maple Icing

Name: Apple and Olive Oil Cake with Maple Icing
Ingredients: 1/2 cup golden raisins (heaping); 4 tablespoons water; 2 1/4 cups all-purpose flour; 1/2 teaspoon ground cinnamon; 1/4 teaspoon salt; 1/2 teaspoon baking powder; 1 1/4 teaspoons baking soda; 1/2 cup olive oil; 3/4 cup superfine sugar; 1/2 vanilla bean; 2 free-range egg, lightly beaten; 3 large Granny Smith apples, peeled, cored, and cut into 3/8-inch dice; Grated zest of 1 lemon; 2 free-range egg whites; Confectioners' sugar, for dusting (optional); 7 tablespoons unsalted butter, at room temperature; 1/2 cup muscovado sugar (scant); 6 tablespoons maple syrup (scant); 8 ounces cream cheese, at room temperature