Instead of using a traditional steamer I put mine in a slow cooker half full of warm water overnight (7 hours) on low. It probably could have been taken out sooner but this turned out well for me. I found in my previous attempts a real difficulty in knowing when it was ready. I expected it to be dry like a sponge but as long as it's not liquid, it 'sets' when it cools.
I also used light brown sugar which gave it a lovely caramel taste. Perfect warm with custard, yum.
