Close this vessel and steam in a double boiler for about 45-55 minutes. [Double Boiler: Take a big vessel, pour some water into it, keep a ring mould (you can make a mould with and empty cheese tin) place the egg custard mixture vessel on the ring, cover the big vessel and bring to a boil, once it comes to a boil, cook it for another 45 minutes or till done].
Prick with a toothpick or a knife to see if it has cooked.
The water in the big vessel should come only to about 1/4 height of the custard
mixture vessel, otherwise the steam will go in the custard mixture and the
custard will become soggy.