Melt low-calorie margarine in bottom of 9 in. (23 cm) cake pan.
Add maple syrup, stirring to mix.
Allow to cool.
Peel, core, and slice apples; then layer over margarine-syrup mixture in cake pan.
Sprinkle with raisins.
Combine cake flour, baking soda, and salt in sifter, and sift into bowl.
Cream together shortening, sugar replacement and 1 T. (15 mL) water.
Beat in eggs and vanilla.
Add sifted ingredients and 2/3 cup (180 mL) water alternately in small amounts, beating well after each addition.
Pour over apples in pan.
Lightly spread to level the batter.
Bake at 350°F (175°C) for 45 to 50 minutes or until toothpick inserted in center comes out clean.
Turn over onto a serving plate immediately after removing from oven.