Sieve the flour in a bowl and put it in the food processor along with sugar and margarine. Blend it so it gets crumbly. Now add cold water to it and wrap it up in a plastic bag. Keep aside for half an hour.
Now roll it out flat and cut out small pieces out of it by the help of a pastry cutter. Take a muffin tray and start filling up the muffins and prick them by a fork. Now bake them in a pre-heated oven at 200 C for 15 minutes.
Now to make the custard cook milk, sugar and vanilla custard in a pan until thick, add in egg white to it and mix thoroughly well. Now pour this custard in the muffin tray over the baked pastry and sprinkle some ground nutmeg. Now bake it again for 10-12 minutes.
Finally, top with some jelly and nuts and serve.