Step 1

Mix cornstarch, flour, egg yolks, 12 Tbsp sugar, vanilla, rum and a few tablespoons cold milk.

Step 2

Boil remaining milk with water in a double boiler.

Step 3

Add egg mixture to milk and continue to cook until thick, stirring very frequently.

Step 4

Beat egg whites until stiff. Add 8 Tbsp sugar. Fold into the custard.

Step 5

Place one layer of puff pastry on bottom of a 9x13 inch (23x33 cm) baking dish. Spread evenly with custard. (You can add a layer of whipped cream on top of custard, if you like.) Cut the second pastry sheet into 15 squares. Lay the squares over custard, pressing down slightly. Refrigerate. Sprinkle Kremsnite / Cremeschnitte with powdered sugar on top before serving.