Method: Portable Gas Cooker (It's either the soup is really really nice or I'm too hungry. *thumbs up*)
It's the stall from the corner of Blk 90 Whampoa Drive. Have seen some other stalls with fish head steamboat too but we have yet to try everything, so this is the first. No wonder they say Balestier is the land of fish head steamboat!
I also realized the hawker centre has 2 sections. While the one I was at (Blk 90) seems vibrant for a Saturday night, the other one looks empty as most of the stalls were not opened (Blk 91).
*shrugs* Good thing is - it's about 10 minutes walk away from my place! :)