If you're looking for authentic Indonesian food and want more than what is offered in the Grand Hyatt Jakarta lounge or what your tinder date recommends, I highly suggest going to Tugu Kunstkring Paleis. A family friend lives in Jakarta and took me there to get a taste of local food.
I had one hour to make my connection when I arrived in KL. We were delayed on the runway for an hour so I was sure I would miss the connection. The flight attendant told me that when we arrived someone would be waiting for me at the gate with instructions on how to proceed.