During steaming, the base of the pudding bowl cannot touch the direct heat of the pan. Lesley Waters demonstrates how to steam puddings without a steamer.
-Lightly scrunch a large sheet of aluminium foil into a rough disc shape.
-Place the aluminium foil into the bottom of the pan. Rest the wrapped pudding on top. Make sure the base of the pudding bowl is not in direct contact with the base of the pan.
-Add enough water to reach halfway up the sides of the pudding bowl.
-Cover the pan tightly with the lid. Steam the pudding according to the recipe instructions.
Source: https://www.bbc.co.uk