In a large bowl beat the eggs until mixed and gradually add the sugar until well combined.
Mix the water and lemon juice together and set aside.
In a separate bowl mix the flour , baking powder and salt together. Fold into the egg mixture alternately with the lemon water.
Stir in the lemon rind and the vanilla and mix well.
Pour the batter into a non-greased 9" bundt pan (or tube pan)
Bake @ 350° for 25-30 minutes or until tooth pick inserted in the center of cake comes out clean.
Place the cake upside down on a funnel to cool (this prevents it from falling) ; Remove the cake from the pan and slice the cake in half ; spread with pie filling and replace the upper part of the cake on top of the filling . Dust lightly with powdered sugar.