Hello @razack-pulo, it is interesting to learn a little history of the Indonesian coffee.
I think those cakes are like what they have in the Philippines known as Sticky Rice. I could be wrong, but I've tried it before. Nice but sweet, so I only have a small amount at a time since I'm not so keen on sugar.
It's amazing how much the Espresso coffee has taken off as mainstream coffee there.
Thanks for stopping by;)
Have a nice day!