Lemon Pudding Cake

I love just about everything lemon.  It adds such a nice flavour to things.  So when I came across this Lemon Pudding Cake, I had to make it!  I love how it "magically" separates to be a cake on top and a pudding on top.  I made this to bring to a dinner at a friend's house and it was a hit!

Ingredients:
1/2 cup flour
1/2 cup sugar
1/2 tsp salt
3 eggs at room temperature, separated
1 cup fresh lemon juice
1 tbsp lemon zest
1 tsp vanilla extract
1/4 cup butter, melted
1-1/4 cups milk or half-and-half
1/4 cup sugar

Directions:

1. Preheat the oven to 350F.  Butter a 9" square cake pan.
2. Combine the flour, 1/2 cup sugar, and salt.  In another bowl, beat the egg yolks until smooth.  Stir in the lemon juice and zest, vanilla, butter and milk (or half-and-half).  Add the flour mixture to the egg yolks. 
3. Beat the egg whites to form soft peaks.  Gradually beat in the 1/4 cup sugar and continue beating until stiff, moist peaks form.  Fold a small amount of the egg whites into the lemon mixture first, then the remaining amount.
4. Pour into the prepared pan.  Set the pan into a large pan filled with one inch of hot water.  Bake for 40-50 minutes.  Serve warm or at room temperature.