Chocolate Walnut-filled Cake

Cake

 * 2 cups cake flour
 * ½ cup unsweetened cocoa
 * 3 tbsp granulated fructose or other sugar replacement
 * 1 tbsp baking powder
 * 1¼ cups milk
 * ¼ cup soft margarine
 * 2 eggs

Filling

 * ½ cup flour
 * ⅓ cup walnuts very finely chopped
 * ⅓ cup milk
 * 1 tsp granulated fructose or other [sugar replacement]]
 * 1 tsp baking powder
 * 1 tsp vanilla extract

Directions

 * 1) Preheat oven to 350°F.
 * 2) Grease and flour a 3 quart size tube pan.

Cake

 * 1) Combine dry ingredients and sift into a bowl.
 * 2) Add remaining ingredients and beat until smooth and creamy.
 * 3) Pour into prepared pan.

Filling

 * 1) Combine all ingredients in a bowl mixing with a fork until well blended.
 * 2) Spoon in a ring over center of chocolate layer being careful not to touch sides of pan with filling mixture.
 * 3) Bake for 35 minutes or until tester comes out clean.
 * 4) Cool in pan for 20–25 minutes,invert onto plate or rack and let cool completely.
 * 5) Frost with a glaze if desired.