Fresh Orange Cake

Heat oven to 350'F. Grease and flour 2 8-inch round layer cake pans. Grate the rind from two of the oranges, then peel these and one other orange, removing all of the white next to the pulp. Discard the peel. Section these oranges, discarding membranes and seeds. Cut the sections into very small pieces. Squeeze the remaining orange and add the juice to the cut-up fruit sections. Measure out 1 1/4 cups of this mixture and add 1/2 cup sugar to it. Stir until the sugar dissolves. Take out 1/4 cup and reserve for the icing.