They brought me to "Sop Sumsum Langsa" which is quite famous for its bone marrow soup. Even Bondan Winarno, an Indonesian culinary expert, recommended this place in one of his articles.
When the soup actually came, I was quite surprise to see this huge bone on my plate. The bone is from a cow's leg because the bone marrow is plenty and easier to process.
The way you eat it is by "slurping" the bone marrow using the straw.
Because it was not what I expected, it did take some time for me to get over the psychological barrier of slurping white gooey stuff out of a cow's leg. With every slurp, I couldn't stop thinking how this must be high in cholesterol! So I didn't enjoy it that much, but it was quite an experience. If you get the chance, please try it!