Low Fat Tiramisu

My sister has been asking me for months to make tiramisu.  For some reason, I always thought tiramisu is very difficult to do.  Or in my mind I think tiramisu is very fattening so I try to avoid making it.  Since my sister has been waiting for months, I searched for a low fat version.  It probably will satisfy her cravings for this coffee-chocolate-cheese dessert, and still doesn't break my bathroom scale. 

Low Fat Tiramisu
recipes adapted from here, and here
(10 servings, 171 calories each, 3.9 grams of fat)

Ingredients:
(for ladyfingers, I made about 52 of them)

4 eggs, separated
1/4 tsp cream of tartar

2/3 cup white sugar

1/4 tsp vanilla extract

7/8 cup all-purpose flour

1/2 tsp baking powder

Directions:

1. Preheat oven to 400 degrees F (205 degrees C). Line two 17 x 12 inch baking sheets with baking parchment. Fit large pastry bag with a plain 1/2 inch round tube.

2. Place egg whites in bowl and beat on high until soft peaks start to form. Slowly add 1/4 tsp cream of tartar then 2 tablespoons of the sugar and continue beating until stiff and glossy. In another bowl beat egg yolks, vanilla extract, and remaining sugar. Whip until thick and very pale in color.

3. Sift flour and baking powder together on a sheet of wax paper. Fold half the egg whites into the egg yolk mixture. Fold in flour, and then add the remaining egg whites. Transfer mixture to pastry bag and pipe out onto prepared baking sheet. Bake 8 minutes.

Ingredients:
(for tiramisu, can make about 2 loaf pans or 1 8"x8" pan)

30 ladyfingers from the above recipe

Filling
1 cup Reduced fat ricotta cheese 
8 oz nonfat cream cheese
1 cup lite sour cream
1 cup nonfat vanilla yogurt
2 tbsp sugar
1 tbsp rum

Soaking Liquid
1 cup of strong coffee
1 tbsp unsweetened cocoa powder
1 tbsp sugar
1 tbsp coffee liquor
more unsweetened cocoa powder for garnish

Directions:

1. In a food processor, combine filling ingredients. Process until smooth, set aside.

2. Combine soaking ingredients in a small bowl.

3. Quickly dip ladyfinger into coffee mixture.

4. Arrange ladyfingers in 2 loaf pans or 1 8"x8" pan.

5. Spread half of the cheese mixture evenly on top.

6. Dip more ladyfingers and arrange on top of the first layer.
7. Top with the remaining filling.
8. Place a toothpick in each corner of the pan and cover pan with plastic wrap. Try not to let the plastic touch the topping.
9. Refrigerate 3 to 8 hours.
10. Sprinkle with remaining cocoa and serve.

I got to use my new toy -- the food processor that hubby bought for me :)
Tiramisu came out sour...I don't know why.  Maybe the coffee that I used that turned sour with the cheese filling?  Maybe the low fat version of the filling? Maybe the rum that I used?  Really not sure what went wrong.  I'll need to try making a full fat version next time to compare the results :)  I was worried about uncooked eggs on other recipes, probably have to try it next time...