Ketupat is a packed rice that wrapped in a woven palm. It needs skills and patience to make the wraps. When it's done with the wraps, all you have to do is fill the wraps with some rice, wrap tightly and then boil them. As the rice cooks, the grains expand to fill the pouch and the rice becomes compressed. How awesome! 
Ketupat is usually eaten with traditional dishes in Indonesia,like rendang, ketoprak or gado-gado.  And it's also served during special occasions such as Eid'l Fitr.