Mix the eggs with the sugar and the salt. Add the 7-up and last the self rising flour. Mix everything well and make sure it is smooth and lump free. Cover your steamer with baking paper and make sure it covers both the bottom as well as the sides.
Put the biggest part of your batter into the pan. Mix the rest of the batter with the cocoa powder. Add this into the pan as well and use a fork or a spatula to make a marbled pattern
Cover the lid of the pan with a teatowel (to prevent water dripping in)
Fill the bottom part of your pan with water and bring to the boil. Put the part with the batter on top and cover with the lid wrapped in the teatowel. leave to simmer and steam on medium fire and make sure it does not boil dry.