Place water and butter in a small sauce pan.
Add flour, salt, and eggs one at a time, whisking after each egg.
Press into a greased 13 by 18 inch pan.
Bake at 400 for 25 minutes.
It will rise as it bakes then go back down after removed from the oven, looking a bit humpy.
For the filling, beat all the ingredients Pour into cooled crust
Add your favorite pie filling (apple, blueberry pumpkin) and spread on top of pudding mixture, chill and serve.